Men’s sunglasses are sized by three numbers inside the temple arm: lens width, bridge width, and temple length.
Finding sunglasses that fit well comes down to a code printed inside the temple arm. That three-number sequence—like 52-18-140—tells you the lens width, bridge width, and temple length in millimeters. Matching those numbers to your face separates a comfortable pair from one that pinches, slides, or leaves your eyes exposed. Most men land in a narrow range, so knowing your numbers makes shopping faster and more reliable. Below is how to read the code, measure without a frame, and get the fit right.
Reading the Three-Number Sizing Code
The three measurements, printed on the inside of the temple arm, are:
- Lens width (eye size) — the horizontal width of one lens. Common men’s sizes run from about 54 mm to 58 mm and larger.
- Bridge width — the distance across the nose between the lenses, determining whether frames pinch or sit too loose.
- Temple length — the arm’s length from hinge to tip, which should reach just behind the ear without pressing into your head.
A code like 52-18-140 breaks down as 52 mm lens width, 18 mm bridge, and 140 mm temples. Lens width most affects how the frame looks, but the bridge is the difference between comfort and a headache by noon. FramesDirect’s sizing guide confirms these measurements apply to sunglasses and eyeglasses alike.
How to Measure Without an Existing Frame
If you don’t have a pair to copy, measuring your face is the next best route. You’ll need a ruler and about two minutes. Start with face width: measure temple-to-temple across the widest part of your face. Frame width should fall within about ±5 mm of that—neither extending past your temples nor looking too narrow. A mirror-and-card test adds a practical check: hold a credit card vertically at the center of your nose and note where its edge falls relative to your eye. Per Ray-Ban’s size guide, if the card’s edge ends at the outside of your eye, standard size fits; beyond the eye, choose small; short of it, choose large.
Then measure bridge width across the nose where the lenses would sit, and estimate temple length by running the ruler from the hinge point to just behind your ear. These numbers prevent the two most common fit failures: frames sliding down from a too-wide bridge, and temples pressing into your head because they’re too short.
Fit Checks That Matter More Than Labels
Sunglass Hut’s size guide classifies fit by combined bridge-and-eye measurements: Small at 71 mm or less, Standard from 72 mm to 75 mm, and Large at 76 mm and above. That’s a useful starting point, but size charts vary by brand—one brand’s “small” may be another’s “medium”—so printed millimeters always beat the S/M/L label. Before committing, run these checks:
- Pupil position: your pupils should sit near the center of each lens; too high or low means the frame is mismatched.
- Nose bridge: the frame should rest without pinching or sliding; too-wide lets it creep down, too-narrow leaves red marks.
- Temple pressure: arms should rest around and behind the ears without squeezing; pressure points mean temple length is off.
- Overall width: viewed straight on, frame edges should align roughly with your temples—not jutting past or leaving eyes exposed.
If a frame sits too low, slides, or rests improperly, you lose comfort and eye coverage. Trying on frames in person remains the most accurate final check.
Common Sizing Mistakes to Skip
Most fit problems trace back to a few recurring errors. The biggest is confusing total frame width with lens width—the printed number describes one lens, not the full front, so a 58 mm lens can still pair with a frame too wide or narrow for your face. Ignoring the bridge measurement is the other classic miss, inviting constant adjustment. Too-wide frames slip and look oversized; too-narrow ones pinch at the temples and nose. Despite marketing around face shapes, proportional fit beats shape labels every time. The same measurement system applies to men’s, women’s, and unisex frames—size isn’t sex-specific. Once you know your numbers, shopping gets easier. For tested budget options, see our roundup of the best budget men’s sunglasses.
| Measurement | Where to Find It | Fit Impact |
|---|---|---|
| Lens width | First number (e.g., 52 mm) | Controls overall look and face proportion |
| Bridge width | Second number (e.g., 18 mm) | Determines pinch versus slippage on the nose |
| Temple length | Third number (e.g., 140 mm) | Affects pressure behind the ears |
| Face width check | Ruler, temple-to-temple | Frame should match within about ±5 mm |
FAQs
What does the number inside the temple arm mean?
The three numbers indicate lens width, bridge width, and temple length in millimeters. A code like 52-18-140 means 52 mm lenses, an 18 mm bridge, and 140 mm temple arms. Matching these to your face ensures the frame centers properly, stays put, and doesn’t pinch.
Is men’s sunglasses sizing different from women’s?
No, the system is identical. Men’s frames typically skew toward wider lens sizes around 54–58 mm, but the same three-number code applies to any frame. Fit depends on your face dimensions, not gender-specific sizing.
What if the size chart and my measurements disagree?
Trust the printed measurements over generic S/M/L labels. Brand size charts vary, and a “standard” fit from one company may differ from another. Run the comfort checks—pupil centering, bridge fit, temple pressure—and prioritize the numbers on the temple arm.
References & Sources
- Ray-Ban. “Ray-Ban Size Guide.” Explains the credit-card mirror test and how to choose small, standard, or large fit.
- Sunglass Hut. “Men’s Size Guide.” Classifies fit by combined bridge-and-eye measurements into small, standard, and large.