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Knockaround Sunglasses Size Guide: Compare Frame Measurements
By Zainab | Blog | Leave a comment / 24 October 2026
Table of Contents
Quick Answer
Knockaround sunglasses come in different sizes depending on the model. For smaller faces, start with Seventy Nines or Classics. Premiums and Mai Tais are Medium, while Fast Lanes, Fort Knocks, Brightsides, and Pacific Palisades are Medium–Large. Torrey Pines are officially Large. For the best fit, compare the frame width, bridge, and temple measurements with glasses you already wear comfortably.
Buying Knockaround sunglasses online sounds easy, until you have to choose the right size. Premiums and Fast Lanes may look similar in photos, but they don’t necessarily fit the same. And those three-number frame measurements? They can be confusing if you don’t know what they mean.
Choose the wrong size, and your sunglasses might pinch your temples, slide down your nose, or rest uncomfortably on your cheeks. Nobody wants uncomfortable frames or the hassle of returning them.
This Knockaround sunglasses size guide will help you compare frame measurements, understand small, medium, and larger options, and find a better match using glasses you already own. We’ll also explain how frame shape, nose pads, and hinges affect comfort, plus what to check when the fit feels wrong.
Start with the quick size snapshot below, then compare your current glasses with the detailed Knockaround size chart.
Knockaround Sunglasses Size Chart: Quick Size Snapshot
Not sure which Knockaround sunglasses size to choose? Start with the models recommended for your head size. This quick chart uses Knockaround’s official size categories to help you narrow down your options before comparing exact measurements.
| Starting Size | Knockaround Models to Compare | What You Should Know |
|---|---|---|
| Small | Seventy Nines, Classics | Seventy Nines are labeled Small (139 mm wide). Classics are a nearby Small–Medium option (138 mm wide). |
| Small–Medium | Classics, Brooklines | Both are labeled Small–Medium, but their frame shapes, widths, and bridges differ. |
| Medium | Premiums, Mai Tais | Both are labeled Medium, with frame widths of 142 mm and 144 mm. |
| Medium–Large | Fast Lanes, Fort Knocks, Brightsides, Pacific Palisades | All fall into the Medium–Large category, but their dimensions and frame designs differ. |
| Large | Torrey Pines | Officially labeled Large, with a 147 mm frame width. Also worth comparing with Medium–Large styles. |
| Sports / Wraparound | Campeones | Labeled Medium–Large in the size specifications, with a wraparound shield lens and adjustable nose pads. |
Before You Choose a Size
Here’s something worth knowing: A wider frame doesn’t always mean a larger fit category. Fast Lanes measure 148 mm across, while Torrey Pines measure 147 mm, yet Knockaround labels Torrey Pines Large.
That’s because frame width is only part of the fit. Bridge shape, lens height, temple design, and how the frame sits on your face also matter.
Our advice: Use this chart to shortlist two or three models, then check the detailed Knockaround frame measurements below. If you already own comfortable glasses, comparing their dimensions is a much better starting point than relying on Small, Medium, or Large labels alone.
Note: These are starting recommendations based on Knockaround’s published size categories, not guaranteed fits. Always check the exact model and version you’re buying, especially Sport, Knockterra, or prescription options.
Knockaround Frame Measurement Comparison Table
Wondering whether Knockaround Premiums, Fast Lanes, or Fort Knocks will fit you better? Comparing their measurements side by side is a good place to start.
The Knockaround sunglasses size chart below covers 11 popular models, including their frame width, height, lens width, bridge width, and temple length.
All measurements are in millimeters (mm) and come from Knockaround’s official product listings. If you already know the measurements of glasses that fit you comfortably, use those numbers as your reference while comparing models.
| Knockaround Model | Frame Width | Frame Height | Lens Width | Bridge Width | Temple Length | Official Size |
|---|---|---|---|---|---|---|
| Classics | 138 | 48 | 49 | 16 | 143 | Small–Medium |
| Seventy Nines | 139 | 46 | 49 | 18 | 142 | Small |
| Premiums | 142 | 51 | 54 | 19 | 143 | Medium |
| Campeones | 142 | 62.3 | 138 (shield) | 39.7* | 133 | Medium–Large |
| Brooklines | 143 | 46.2 | 50 | 23 | 140 | Small–Medium |
| Mai Tais | 144 | 50 | 54 | 20 | 140 | Medium |
| Brightsides | 145 | 52.8 | 55 | 17.8 | 145 | Medium–Large |
| Pacific Palisades | 146 | 51.8 | 54 | 19 | 141 | Medium–Large |
| Torrey Pines | 147 | 53.2 | 58 | 18 | 142 | Large |
| Fast Lanes | 148 | 49 | 56 | 15 | 142 | Medium–Large |
| Fort Knocks | 148 | 49 | 54 | 21 | 139 | Medium–Large |
Measurements checked against official Knockaround listings on October 24, 2026. These are manufacturer specifications, not measurements taken by Sunglasses Advisor.
Campeones use a single wraparound shield lens with a listed 39.7 mm nose bridge measurement. Their lens and bridge dimensions should not be compared directly with conventional two-lens frames. Although Knockaround describes Campeones as suitable for large heads, its specification lists Medium–Large.
Compare Frame Styles, Face Shapes, and Hinges
Measurements tell you how large the frame is, but they don’t tell the whole story.
Frame shape can change how sunglasses look on your face, while hinges and nose pads can affect how comfortably they sit.
Here’s how the same Knockaround models compare.
| Model | Frame Style | Brand-Listed Face Shapes | Hinges / Fit Features |
|---|---|---|---|
| Classics | Square | Square, Rectangle, Oval | High-quality hinges; spring mechanism not specified |
| Seventy Nines | Square | Heart, Square, Oval | Durable 5-barrel hinges documented for Rx versions; standard version's spring mechanism not specified |
| Premiums | Square | Square, Rectangle, Oval | High-quality hinges; Sport version has nose pads |
| Brooklines | Round / Browline | Heart, Square, Diamond, Rectangle | Adjustable nose pads; spring mechanism not specified |
| Mai Tais | Round | Heart, Square | Strong metal hinges; spring mechanism not specified |
| Brightsides | Rectangle (square-inspired styling) | Diamond, Rectangle, Oval | Spring hinges confirmed |
| Pacific Palisades | Aviator-inspired | Diamond, Rectangle, Oval | Spring mechanism not specified |
| Torrey Pines | Square | Round, Rectangle, Diamond, Oval | Metal spring hinges confirmed |
| Fast Lanes | Square | Round, Diamond, Rectangle, Oval | High-quality hinges; Sport version has nose pads |
| Fort Knocks | Square | Oval, Round, Rectangle, Diamond | Spring hinges confirmed |
| Campeones | Wraparound Shield | Round, Diamond, Rectangle, Oval | Adjustable rubber nose pads; spring mechanism not specified |
A quick note: Face-shape suggestions are about styling, not guaranteed physical fit. Also, spring hinges not confirmed simply means the feature wasn’t established by the referenced listing. It doesn’t prove the model lacks them.
Why the size label isn’t everything: Brooklines are classified as Small–Medium despite measuring 143 mm across, while Premiums are classified as Medium at 142 mm. This shows why you should compare the full frame dimensions rather than relying on a size label alone.
Interactive Knockaround Sunglasses Size Finder
Not sure which Knockaround model to compare first? Use our interactive size finder to narrow your options based on head size, fit concerns, frame preferences, and measurements from glasses you already wear comfortably.
The results are a starting shortlist, not a guaranteed fit. Always confirm the exact model and variant before ordering.
Models worth comparing
This is a measurement comparison helper, not a fit guarantee or professional fitting. Figures are manufacturer-published references. Confirm the exact Original, Sport, Knockterra or prescription variant before ordering. Your answers are not sent or stored by this tool.
How to Read Knockaround Frame Numbers
The Three Numbers on the Inside Temple
Ever noticed numbers like 54–19–143 printed inside sunglasses and wondered what they mean?
These are frame measurements in millimeters (mm). They tell you the width of one lens, the space between the lenses, and the length of the arms. Not every Knockaround model has these numbers printed inside, but you can find published dimensions in the brand’s product size guide.
Take Knockaround Premiums as an example:
54 mm Lens width: The horizontal width of one lens, not the entire frame.
19 mm Bridge width: The distance between the lenses. The bridge’s shape also affects how the sunglasses sit on your nose.
143 mm Temple length: The length of each arm. Its curve and how it sits behind your ears also affect comfort.
142 mm Frame width: The total width across the frame front. This is especially useful when checking whether sunglasses might feel tight at your temples.
51 mm Frame height: The vertical height of the frame, which can affect coverage, appearance, and whether it touches your cheeks.
Important: Total frame width is a separate measurement. You cannot calculate it by simply adding the three numbers.
Our tip: If your current sunglasses fit comfortably, compare their frame width, bridge, and temple measurements with the Knockaround pair you’re considering. It’s a more useful starting point than choosing by appearance alone.
Lens Width vs. Frame Width: What’s the Difference?
Lens width tells you how wide one individual lens is, while frame width measures the sunglasses across the entire front.
For example, Knockaround Classics have 49 mm lenses and a 138 mm frame width. Brooklines have slightly wider 50 mm lenses, but their overall frame measures 143 mm.
That’s why similar lens measurements don’t necessarily mean two frames will fit the same.
Our advice: Compare overall frame width first when assessing room at the temples, then consider lens proportions, bridge design, and frame height. For wraparound shields such as Campeones, use the separate measurements and notes in the main comparison table.
Bridge Width and Temple Length: Why They Matter
Have you ever worn sunglasses that looked like the right size but kept sliding down your nose or felt uncomfortable behind your ears?
The bridge and temples could be part of the reason.
Bridge width: Compare these Knockaround examples:
Classics: 16 mm bridge
Premiums: 19 mm bridge
Brooklines: 23 mm bridge
Campeones: 39.7 mm published bridge measurement (wraparound design)
A wider bridge number doesn’t automatically mean a better fit for a wider nose. The bridge shape, your nose shape, and how the frame makes contact with your skin matter too. Nose pads can also change how a frame sits.
Temple length: Eyewear arm lengths commonly include 135, 140, 145, and 150 mm, but none is automatically right for everyone.
For example, Classics and Premiums both have 143 mm temples, while Brooklines measure 140 mm. Arm length alone won’t tell you which feels more secure. The arm’s curve, hinge design, and position behind your ears also influence comfort.
The takeaway: Bridge width and temple length are useful measurements, but the frame’s shape, hinge design, and contact with your face also influence comfort.
How to Measure Your Face or Current Glasses at Home
Not sure which Knockaround size will fit you? Before guessing between Small, Medium, or Large, grab a pair of glasses you already love wearing.
If they sit comfortably, stay in place, and don’t squeeze your temples, their measurements can give you a helpful starting point. All you need is a millimeter ruler and a few minutes.
Measure Your Current Glasses (Preferred Practical Starting Point)
Choose a pair you can wear for hours without slipping, pinching, or touching your cheeks uncomfortably. Then follow these seven simple steps.
Check the numbers inside the arm. Look for a code like 54–19–143. These numbers usually represent lens width, bridge width, and temple length in millimeters. Write them down if available.
Measure the full frame width. Hold a ruler across the front, from the farthest left edge to the farthest right edge. This tells you the overall frame width, an important measurement when checking for a tight or loose fit.
Measure one lens. Measure horizontally across the widest part of one lens. Remember, lens width is different from total frame width.
Check the bridge width. Measure the space between the lenses at the bridge’s narrow point. This is only an estimate, as different bridge shapes and manufacturer measurement methods can produce different figures.
Measure the temple length. Follow the arm from the hinge to its tip using a flexible measuring tape or string. Because arms curve, a straight-line measurement may not match the manufacturer’s published length.
Record the frame height. Measure vertically from the highest to the lowest point of the frame front. Also notice whether your glasses touch your cheeks when you smile.
Compare your results. Match frame width with frame width, lens width with lens width, and so on, using the detailed Knockaround size chart above.
Here’s a practical example: Suppose your comfortable glasses measure 54–19–143, with a total frame width of 142 mm. Knockaround Premiums share those published measurements, making them a reasonable model to compare first.
That doesn’t guarantee the same fit, though. Frame shape, nose contact, and arm design still matter.
Quick tip: No ruler nearby? A standard payment card is approximately 85.6 mm wide, so it can help you estimate measurements. But when a few millimeters matter, always use a proper ruler.
Measure Your Face Width (Supplementary Check)
Don’t have a comfortable pair to compare? You can also measure your face width.
Ask someone to help you measure the approximate straight-line distance from one temple area to the other, using a ruler or flexible tape held level across the front. Avoid following the curves of your face, as that gives a different measurement.
This gives you a rough reference, but your face width doesn’t automatically determine your Knockaround size.
Two people with similar face widths may need different frames because of their nose shape, cheekbones, ear position, and preferred fit.
When comparing sunglasses, pay attention to these signs:
Eye alignment: Your eyes should sit comfortably within the lens area.
Temple pressure: The arms shouldn’t squeeze the sides of your head.
Temple spread: The arms shouldn’t need excessive outward bending to sit on your face.
Nose fit: The bridge should feel secure without digging in or constantly slipping.
Cheek clearance: The frames shouldn’t press uncomfortably against your cheeks, especially when smiling.
Our advice: Use face width to narrow your options, not to make the final decision. Knockaround’s Small, Medium, and Large labels describe its frame categories, not universal face-width measurements.
Printable At-Home Measurement Card
Want to keep your measurements handy while comparing Knockaround models? Use our printable measurement card to record the dimensions of your current glasses before shopping.
Before measuring: Print the PDF at 100% (Actual Size) and turn off Fit to Page. Check the included 50 mm calibration line against a physical ruler to make sure it printed correctly.
Once you’ve recorded your measurements, keep them beside you while reviewing the detailed Knockaround size chart. It makes comparing models much easier, especially when you’re choosing between two similar-looking frames.
Download Free Measurement Card (PDF)
Print at 100% (Actual Size)
Head Size Categories and Matching Knockaround Models
Not sure whether you need Small, Medium, or Large Knockaround sunglasses? The good news is that Knockaround provides recommended head-size categories for its frames, making it easier to narrow your choices.
But remember, these are brand sizing recommendations, not guaranteed fits. Two people with similar head sizes may find different frames comfortable because of their nose shape, cheekbones, and temple fit.
1. For Small and Narrow Faces
If sunglasses often look oversized, slide down your nose, or feel too wide at the temples, start with Seventy Nines and Classics.
Seventy Nines: 139 mm frame width, officially Small.
Classics: 138 mm frame width, officially Small–Medium.
Brooklines: 143 mm frame width, also Small–Medium, but with a different browline-inspired shape and wider listed bridge.
Are Seventy Nines smaller than Premiums?
Yes, in some important measurements. Seventy Nines measure 139 mm across the front compared with 142 mm for Premiums. Their lenses are also smaller (49 vs. 54 mm), while their bridges measure 18 and 19 mm respectively.
That makes Seventy Nines a reasonable starting point if Premiums feel too large. However, Classics are slightly narrower across the front, so don’t judge by size labels alone.
Our advice: For smaller faces, pay attention to how securely the temples sit, whether the bridge slips, and whether the frame touches your cheeks. A smaller lens doesn’t automatically guarantee a better fit.
Still choosing between Classics and Premiums? Classics have a 138 mm frame width and a Small–Medium fit, while Premiums measure 142 mm and are classified as Medium. If you’re unsure which one better suits your needs, explore our Knockaround Premiums vs Classics comparison for a closer look at their differences.
2. For Medium Faces
For a medium-sized fit, Premiums and Mai Tais are two good models to compare.
Premiums have a 142 mm frame width with a classic square shape. Mai Tais measure 144 mm across and feature a rounder design.
Interestingly, both have 54 mm lenses, but that doesn’t mean they’ll feel identical.
If you prefer a structured, everyday look, Premiums are worth considering first. If you like rounder frames or a slightly broader front, take a look at Mai Tais.
What if you prefer oversized sunglasses?
That’s perfectly fine! Just remember that an intentionally oversized look shouldn’t mean constantly pushing your sunglasses back up your nose.
Look for a secure bridge, comfortable temples, and enough cheek clearance. A frame can look oversized while still fitting comfortably.
3. For Medium–Large Faces
If standard medium frames feel tight around your temples, Knockaround’s Medium–Large options give you several designs to compare.
Fast Lanes and Fort Knocks are both worth comparing for wider faces, but their bridge designs, temple lengths, and hinge features differ. If you’re deciding between them, check the detailed Fast Lanes vs. Fort Knocks comparison later in this guide before choosing.
You can also consider:
Brightsides (145 mm): A square-style option with 55 mm lenses.
Pacific Palisades (146 mm): An aviator-inspired frame with 54 mm lenses.
Campeones (142 mm): A wraparound sports design with a single shield lens and adjustable nose pads.
Campeones deserve special attention if you’re shopping for sports. Their shield design and bridge measurements aren’t directly comparable to ordinary two-lens frames, even though Knockaround places them in its Medium–Large size category.
Our advice: If you’re choosing between Medium–Large models, compare more than front width. Consider bridge shape, arm design, and the style you actually want to wear.
4. For Large and Wide Heads
Finding comfortable sunglasses for a wider head can be frustrating, especially when frames squeeze your temples or the arms spread too far outward.
Torrey Pines are a good starting point because Knockaround officially classifies them as Large.
They feature:
147 mm total frame width
58 mm lens width
Metal spring hinges that provide some outward flexibility
Although Torrey Pines are officially Large, some Medium–Large frames are slightly wider across the front. This is why it’s worth checking the full measurements and frame design rather than assuming that the Large label always means the widest frame.
Brightsides, at 145 mm wide, are another Medium–Large option to consider if their design and other measurements match your preferences.
One important thing about spring hinges: They can help the arms flex outward, but they won’t turn a fundamentally too-small frame into the right size. You still need enough room across the front and a comfortable bridge fit.
Our advice: Start with Torrey Pines if you’re looking for an officially Large Knockaround model. Then compare Fast Lanes, Fort Knocks, and other relevant Medium–Large styles against sunglasses that already fit you well.
The takeaway: Knockaround’s head-size categories are useful for narrowing your options, but your most reliable buying decision comes from combining those categories with actual frame measurements and the fit of your existing glasses.
Face Shape Matching Guide
Not sure which Knockaround sunglasses will look good on your face? Your face shape can help you choose a flattering frame style, but it doesn’t tell you what size to buy.
For example, round faces may look more defined with angular frames, while square faces can get a softer look from rounded styles. But these are styling suggestions, not strict rules. You can wear whichever shape you prefer.
Knockaround also lists recommended face shapes for individual models. Here’s a quick guide to help you explore your options.
| Face Shape | Knockaround Models to Consider |
|---|---|
| Round | Torrey Pines, Fast Lanes, Fort Knocks, Campeones |
| Square | Premiums, Classics, Seventy Nines, Mai Tais |
| Oval | Premiums, Classics, Fort Knocks, Torrey Pines, Fast Lanes |
| Rectangle | Premiums, Classics, Torrey Pines, Brightsides, Brooklines |
| Diamond | Torrey Pines, Fort Knocks, Brightsides, Brooklines, Campeones |
| Heart | Seventy Nines, Mai Tais, Brooklines |
These examples follow Knockaround’s official face-shape suggestions. They’re styling starting points, not the only frames you can wear.
Face Shape vs. Frame Fit: What’s the Difference?
Here’s something many online shoppers overlook: two people with the same face shape can need completely different sunglasses sizes.
Take heart-shaped faces, for example. Knockaround recommends Seventy Nines, Mai Tais, and Brooklines, but their frame widths are 139 mm, 144 mm, and 143 mm, respectively.
That means a model may suit your facial proportions without necessarily fitting comfortably.
So, before choosing a pair, check three things:
Style: Do you like how the frame shape balances your facial features?
Size: Does its overall width suit your head without squeezing or feeling loose?
Comfort: Are your eyes comfortably positioned within the lenses? Does the bridge sit securely, and do the frames clear your cheeks?
Our advice: Use face-shape recommendations to discover styles you like, then compare the actual measurements with your comfortable glasses. A flattering frame should also feel good enough to wear throughout the day.
Spring Hinges: What They Do and Which Knockaround Models Have Them
Ever worn sunglasses that squeeze the sides of your head, especially after a few hours? Spring hinges may help make the temples more comfortable.
Unlike regular hinges, spring hinges allow the arms to flex slightly outward beyond their normal open position. This extra flexibility may reduce side pressure, particularly if you have a wider head.
Which Knockaround Sunglasses Have Spring Hinges?
According to Knockaround’s official product information, three models in this guide offer documented spring hinges.
| Knockaround Model | Frame Width | Spring Hinge Feature |
|---|---|---|
| Brightsides | 145 mm | Spring hinges; Medium–Large |
| Fort Knocks | 148 mm | Hidden spring hinges; Medium–Large |
| Torrey Pines | 147 mm | Metal spring hinges; Large |
Spring hinges allow the arms to flex slightly outward, which may improve comfort for some wearers. However, they cannot correct an unsuitable frame width or poorly fitting nose bridge.
If hinge flexibility is important to you, compare these three models using their complete measurements rather than choosing by the hinge feature alone.
Can Spring Hinges Fix Sunglasses That Are Too Tight?
Not always. Spring hinges give the arms more flexibility, but they can’t fix a frame that’s fundamentally too narrow for your head.
For example, if your sunglasses squeeze your temples because the frame front is too small, choosing a wider frame may help more than adding flexible hinges.
And remember, hinges are only one part of a comfortable fit. Bridge shape affects how the sunglasses rest on your nose, while temple length and arm design influence how they sit around your ears.
Our advice: If you’re looking for documented spring hinges, compare Brightsides, Fort Knocks, and Torrey Pines. Their frame widths and recommended size categories differ, so use your existing glasses as a reference before choosing.
Prescription Lens Considerations
If you wear prescription glasses, choosing the right Knockaround frame involves more than finding a comfortable size. Lens width, frame shape, and where your eyes sit inside the lenses can also affect how your finished prescription sunglasses look and feel.
Does Lens Size Matter for Prescription Sunglasses?
Yes, especially if you have a stronger prescription. Larger lenses can sometimes be thicker or heavier, depending on your prescription, lens material, shape, and design.
For example, these Knockaround models have different individual lens widths:
Classics: 49 mm
Seventy Nines: 49 mm
Brooklines: 50 mm
Premiums: 54 mm
Smaller lenses may help reduce thickness in certain prescriptions, but smaller doesn’t automatically mean better. A frame must also fit your nose, provide enough lens height, and position your eyes correctly.
If you have a stronger prescription, ask your dispensing optician which frame dimensions and lens options would work best rather than choosing based on lens width alone.
Why Pupillary Distance Matters
Ever heard of pupillary distance (PD)? It’s simply the distance between the centers of your pupils.
This measurement helps position the prescription lenses correctly in front of your eyes. Your eye position within the frame also matters, especially when choosing larger or unusually shaped sunglasses.
For additional context, the College of Optometrists’ pupillary distance guidance explains the role of PD in spectacle dispensing. If you’re unsure about your measurements or lens requirements, consult your dispensing optician.
For example, even if a frame feels comfortable, it may not be suitable for your prescription if the lenses cannot be positioned correctly.
If you’re ordering prescription sunglasses online, use an accurate PD measurement and make sure the selected frame supports your prescription requirements.
Can You Get Knockaround Sunglasses With Prescription Lenses?
Yes, but not every Knockaround model or version is necessarily available with prescription lenses.
Knockaround currently offers prescription versions of models such as Premiums Rx and Seventy Nines Rx.
Before ordering, check the exact Rx product listing for supported prescription strengths, PD requirements, available lens types, and frame measurements. Some versions offer single-vision and progressive lenses, but eligibility depends on your prescription and selected frame.
Availability note: Knockaround’s prescription eyewear program is currently available to U.S. customers only. Check the exact Rx model and your prescription eligibility before ordering.
Popular Knockaround Model Size Comparisons
Still deciding between two Knockaround styles? Some models look similar in photos but have surprisingly different measurements. Others share the same frame width yet may sit differently on your nose and temples.
These quick comparisons highlight the differences that matter most, so you can narrow your options without getting lost in specifications.
1. Premiums vs. Fast Lanes: Which Is Wider?
Fast Lanes are 6 mm wider than Premiums, measuring 148 mm across the front compared with 142 mm. That makes Fast Lanes a reasonable option to compare if you like Premiums but find them tight around your temples.
| Measurement | Premiums | Fast Lanes |
|---|---|---|
| Frame width | 142 mm | 148 mm |
| Lens width | 54 mm | 56 mm |
| Bridge width | 19 mm | 15 mm |
| Temple length | 143 mm | 142 mm |
| Frame height | 51 mm | 49 mm |
But there’s more to the fit than width. Fast Lanes have slightly wider lenses and a shorter frame height, while their listed bridge is 4 mm narrower. These differences can change how the sunglasses sit around your nose, eyes, and cheeks.
Which should you compare first? Start with Premiums if you prefer a medium-sized frame. Consider Fast Lanes if you need more width across the front. Just don’t assume the wider option will automatically solve nose slipping or discomfort.
Independent fit perspective: In its hands-on review of Knockaround Fast Lanes, OutdoorGearLab found that the frame worked particularly well for wider faces, while it could feel oversized on smaller or narrower faces.
This observation supports looking beyond the size label, although it reflects the reviewer’s experience rather than a guarantee for every wearer.
Explore the exact models:
2. Fast Lanes vs. Fort Knocks: Same Frame Width, Different Fit
Both Fast Lanes and Fort Knocks measure 148 mm across the front, but that doesn’t mean they’ll feel identical.
| Measurement | Fast Lanes | Fort Knocks |
|---|---|---|
| Frame width | 148 mm | 148 mm |
| Lens width | 56 mm | 54 mm |
| Bridge width | 15 mm | 21 mm |
| Temple length | 142 mm | 139 mm |
| Frame height | 49 mm | 49 mm |
Explore the exact models:
| Measurement | Fast Lanes | Torrey Pines |
|---|---|---|
| Frame width | 148 mm | 147 mm |
| Lens width | 56 mm | 58 mm |
| Frame height | 49 mm | 53.2 mm |
| Bridge width | 15 mm | 18 mm |
| Temple length | 142 mm | 142 mm |
Explore the exact models:
| Measurement | Classics | Seventy Nines |
|---|---|---|
| Frame width | 138 mm | 139 mm |
| Lens width | 49 mm | 49 mm |
| Bridge width | 16 mm | 18 mm |
| Temple length | 143 mm | 142 mm |
| Frame height | 48 mm | 46 mm |
Explore the exact models:
Explore the exact models:
| Measurement | Brooklines | Classics |
|---|---|---|
| Frame width | 143 mm | 138 mm |
| Lens width | 50 mm | 49 mm |
| Bridge width | 23 mm | 16 mm |
| Temple length | 140 mm | 143 mm |
| Frame height | 46.2 mm | 48 mm |
Explore the exact models:
Remember: The best comparison isn’t just which model is bigger or smaller. It’s which frame’s overall dimensions and design most closely match sunglasses you already find comfortable.
Why Two Knockaround Frames With Similar Measurements Can Fit Differently
What to check: Don’t compare width alone. Look at the overall frame shape, how the arms sit, and whether the lenses feel comfortably positioned in front of your eyes.
What to check: Look for a bridge that rests comfortably without digging in, sitting too low, or constantly sliding. If you often struggle with slipping, comparing nose-pad designs may be more useful than simply choosing a narrower bridge number.
What to check: If your sunglasses squeeze the sides of your head, compare both front width and hinge design. A wider frame may be a better starting point than relying only on flexible hinges.
What to check: The arms should rest comfortably without digging in behind your ears, spreading excessively outward, or feeling unstable when you move your head.
What to check: Make sure the frames don’t press uncomfortably against your cheeks when you smile or move your face. If you prefer oversized sunglasses, pay particular attention to frame height and nose position.
The takeaway: The right Knockaround fit depends on a combination of overall measurements, frame shape, nose contact, and temple design, not just one number or face-shape label. Use sunglasses you already wear comfortably as your starting reference, then compare the details that matter most to your fit.
Fit Troubleshooting: Common Knockaround Sunglasses Problems
| Fit Problem | What to Check | What to Try Next |
|---|---|---|
| Pinching at temples | Frame width, temple spacing, and hinge flexibility | Compare wider frames and models with documented spring hinges. |
| Slipping down nose | Bridge shape, nose contact, frame angle, and overall looseness | Compare bridge designs and Sport versions with rubber nose pads. |
| Pressure behind ears | Temple length, arm curvature, and ear position | Compare temple designs or ask an optician about suitable adjustments. |
| Nose discomfort | Bridge shape, contact area, and weight distribution | Consider a different bridge or nose-pad design rather than bridge width alone. |
| Frames touch cheeks | Frame height, bridge position, and facial proportions | Compare shorter frames and check how high they sit on your nose. |
| Too oversized or unstable | Overall width, frame height, and temple grip | Compare measurements with a comfortable existing pair. |
| Same width, different fit | Bridge, lens shape, hinges, and arm design | Compare the complete dimensions, not just front width. |
Our advice: Check both frame width and hinge design. Longer temple arms alone won’t necessarily solve pressure at the sides of your head.
How Do You Know Sunglasses Are Too Big?
Oversized sunglasses can look great, but an oversized style and a loose fit aren’t the same thing.
Your sunglasses may be too large if they:
Slide repeatedly during normal movement.
Feel unstable when you look down.
Need constant adjustment to stay in place.
Sit loosely around your nose or temples.
A larger-looking frame can still fit securely. The goal is to get the appearance you like without sacrificing comfort.
If your sunglasses feel unstable, compare their width and bridge design with a pair that fits you well.
Can Knockaround Sunglasses Be Adjusted?
Some eyewear frames can be professionally adjusted, but you shouldn’t assume every Knockaround model can be reshaped safely.
I couldn’t confirm a general manufacturer-approved adjustment procedure that applies to all Knockaround models.
If your sunglasses feel crooked, tight, or loose, contact Knockaround or ask a qualified optician whether your particular frame can be adjusted.
Avoid trying to fix the fit by heating, bending, or forcing the frame yourself. You could damage the frame, hinges, or lenses.
If a new pair is significantly uncomfortable, choosing a different model or checking the applicable return options may be better than trying to change its shape.
At-Home Fit Checklist
Before deciding whether your Knockaround sunglasses fit properly, put them on and check these six things:
Fit checks
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If your sunglasses pass these checks, that’s a good sign. If they don’t, return to the measurement comparison table and check which frame dimensions or design features might be responsible.
The takeaway: A comfortable fit isn’t just about choosing Small, Medium, or Large. Pay attention to where your sunglasses feel uncomfortable, then use the frame measurements and design details to narrow down a better option.
How to Choose the Right Knockaround Size When Buying Online
Buying sunglasses online can feel like a guessing game, especially when you can’t try them on first. Even after comparing frame measurements, a few final checks can help you avoid choosing the wrong pair.
Before placing your order, here’s what I recommend looking at.
Check the Exact Model and Variant
Found a Knockaround frame you like? Make sure you’re checking the specifications for the exact version you’re buying.
Some Knockaround styles come in Original, Sport, Knockterra, or prescription configurations. Features can vary between versions, including lens technology, nose pads, and other fit details.
For example, Premiums Sport and Fast Lanes Sport have rubber nose pads designed for additional grip. Don’t assume the regular versions have the same features.
Always check the selected product’s measurements and fit features rather than relying on another version’s description.
Use Product Photos and On-Face Images Wisely
Product photos can help you understand how sunglasses might look on a real face.
Look at the front, side, and on-face images to get a better idea of frame proportions, lens coverage, and how the arms sit.
But remember, a frame that looks perfectly sized on a model might fit you differently. Camera angles, facial proportions, and the model’s head size can all affect its appearance.
Use photos to judge the style, then rely on measurements and your existing glasses to assess the possible fit.
What If You’re Buying Knockaround Sunglasses as a Gift?
If you’re buying sunglasses for someone else, the safest starting point is a pair they already wear comfortably.
If you can, check the frame numbers and overall width without guessing their head size from photographs.
Don’t have access to their glasses? Use Knockaround’s size categories to narrow your options, but avoid treating the recipient’s face shape as a size measurement.
Before ordering, check whether the exact product qualifies for returns or exchanges, especially if you’re unsure about the fit.
Read Owner Fit Reviews With Context
Customer reviews can reveal useful details that measurements alone might miss.
Instead of relying on a review that simply says “Fits perfectly,” look for feedback mentioning:
Whether the reviewer has a narrow or wide head.
If the sunglasses slip, pinch, or stay secure.
How they feel during walking, driving, or sports.
Whether the fit differs from another Knockaround model.
For example, someone comparing Fast Lanes with Premiums may offer more useful sizing context than someone who only comments on the frame color.
Our advice: Treat owner feedback as personal experience, not proof that a frame will fit everyone the same way.
Confirm Returns and Exchanges Before Ordering
Even with careful measurements, sunglasses may feel different once you put them on.
That’s why checking the return policy before buying is important, especially for first-time buyers and anyone ordering prescription sunglasses or shopping internationally.
According to Knockaround’s Returns & Exchanges policy, eligible purchases can be returned or exchanged within 45 days of purchase, provided the product is unused, undamaged, and in its original packaging.
However, there are important conditions:
Free return labels: You must purchase the Free Returns + Package Protection option at checkout. Otherwise, you’re responsible for return shipping costs.
Final-sale exclusions: Limited Editions, Mystery shades, specified promotional purchases, and items marked final sale aren’t eligible.
International and prescription orders: These are final sale under the published policy.
Original shipping charges: These are non-refundable.
These terms apply to Knockaround’s published return program. If you’re ordering through another retailer, check that seller’s own policy.
Important: Don’t assume every Knockaround purchase includes free returns or an unrestricted at-home trial. Return conditions matter, and policies can change.
Our advice: If you’re choosing between two similar Knockaround models, go with the one whose measurements and design are closer to a pair you already wear comfortably. If you’re still uncertain, check return eligibility before committing. A few careful checks now can save you from uncomfortable sunglasses and an avoidable return later.
Knockaround Sunglasses Size FAQs
Do Knockaround sunglasses run small or large?
It depends on the model. Knockaround offers different frame sizes rather than one standard fit across its collection. For example, Seventy Nines are classified as Small, Premiums as Medium, and Torrey Pines as Large. Your best starting point is to compare the model’s official measurements with sunglasses you already wear comfortably.
Are Knockaround Premiums small or medium?
Knockaround Premiums are officially classified as Medium. They measure 142 mm across the frame front, with 54 mm lenses, a 19 mm bridge, and 143 mm temples. They’re a reasonable starting point for medium-sized heads, but if your current glasses feel tight or loose, compare the full measurements before ordering.
Are Fast Lanes bigger than Premiums?
Yes, Fast Lanes are 6 mm wider across the front than Premiums, measuring 148 mm versus 142 mm. They also have slightly wider lenses (56 vs. 54 mm), but their listed bridge is narrower (15 vs. 19 mm). Fast Lanes may offer more room at the sides, though the different bridge shape can affect comfort.
Which Knockaround sunglasses are best for small faces?
Seventy Nines and Classics are good starting points for small faces. Seventy Nines are officially Small at 139 mm wide, while Classics are Small–Medium at 138 mm. Brooklines are another Small–Medium option, measuring 143 mm across. Compare the bridge, temple fit, and cheek clearance before deciding which might suit you better.
Which Knockaround sunglasses are best for large heads?
Torrey Pines are the first model I’d compare for a large head, as Knockaround officially classifies them as Large. They measure 147 mm wide and feature metal spring hinges. Fast Lanes and Fort Knocks are also worth considering at 148 mm, although both belong to the Medium–Large category. The wider measurement doesn’t guarantee a better fit.
Are Fast Lanes and Fort Knocks the same size?
They share the same 148 mm frame width and 49 mm height, but their other measurements differ. Fast Lanes have 56 mm lenses, a 15 mm bridge, and 142 mm temples. Fort Knocks have 54 mm lenses, a 21 mm bridge, and 139 mm temples, plus spring hinges. These differences may affect how each frame sits.
What does 54–19–143 mean on sunglasses?
These three numbers represent lens width, bridge width, and temple length in millimeters. For example, Knockaround Premiums have 54 mm lenses, a 19 mm bridge, and 143 mm temples. They don’t tell you the full frame width, which is a separate measurement. For Premiums, the overall front width is 142 mm.
Is frame width more important than lens width?
Both measurements matter, but they tell you different things. Frame width describes the overall front and is useful when comparing room at the temples. Lens width describes one individual lens and helps you understand lens proportions. For a better fit comparison, also consider bridge shape, temple design, and frame height.
Can someone with a wide face wear Knockaround Premiums?
Possibly, but it depends on their measurements and preferred fit. Premiums are officially Medium, with a 142 mm frame width. Some wider-face wearers may find them comfortable, while others may experience temple pressure. If your current glasses are noticeably wider, compare Fast Lanes or Fort Knocks before deciding.
Do Knockaround Sport versions fit differently?
They can feel different because of their grip features. For example, Premiums Sport and Fast Lanes Sport include rubber nose pads designed to help the frames stay in place. Their published dimensions may match the corresponding Original versions, but nose contact and stability can differ. Always check the specifications for the exact Sport variant you’re considering.
Can Knockaround sunglasses be fitted with prescription lenses?
Yes, selected Knockaround models are available in prescription versions, including Premiums, Fast Lanes, Seventy Nines, and Torrey Pines. However, prescription availability and eligibility vary by model and individual prescription. Knockaround currently offers its prescription collection to U.S. customers only. Check the official prescription collection and consult your dispensing optician about lens suitability.
What if I order the wrong Knockaround sunglasses size?
Eligible Knockaround orders can be returned or exchanged within 45 days of purchase, provided the products are unused, undamaged, and in their original packaging. Free return labels depend on selecting the relevant protection option at checkout. International, prescription, and certain final-sale purchases are excluded. Always review the official Returns & Exchanges policy before ordering.
How I Researched This Knockaround Size Guide
About the Author
Hi, I’m Zainab, the person behind Sunglasses Advisor. I created this website to make eyewear easier to understand and help readers make informed choices about sunglasses and lenses.
For this guide, I studied Knockaround’s official frame measurements, documented fit features, and established eyewear-fitting principles. My goal is to help you compare the models more confidently and understand what to check before buying online.
You can learn more about my experience and research approach on my Author Profile.
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