Find the Perfect Size
Find your perfect sunglasses size with our easy fit guide. Learn frame-to-frame vs hinge-to-hinge measurements, how to read temple numbers, and choose the best style for your face shape.
You will find a Quick Sunglasses Size Estimator at the bottom of this guide.
Use the same method to compare like-for-like.
Rule of thumb: frame-to-frame usually reads ~3–5 mm wider than hinge-to-hinge on the same pair because it includes the frame’s outer edges.
Size l Frame-to-Frame
Small - 120–128 mm l Medium - 129–135 mm l Large - 136 mm+
Tip: If you land between sizes, choose the larger for all-day comfort.
Use a ruler or tape in millimetres.
Front view (use the correct diagram):
Side view (temple):
Most frames show something like: 52 ▢ 18 – 145
Quick width estimate from those numbers
Use this to sanity-check your measurement:
Approx. Frame Width ≈ (2 × Lens Width) + Bridge Width
Example: 54 ▢ 20 – 140 → (2 × 54) + 20 = 128 mm (approx.)
This estimate doesn’t include outer rim thickness, so actual frame-to-frame can be a few mm wider, and hinge-to-hinge a few mm narrower. Use it as a cross-check, not a replacement for measuring.
Use our Styles visual (more realistic silhouettes) to quickly recognise shapes:
Oversize · Aviator · Cat Eye · Wayfarer · Square · Hexagonal · Rectangular
Style preference > “rules” - pick what you love.
Popular questions asked by you
Sizing FAQ’s
Do your sunglasses feel a little too loose, oversized, or maybe the arms don’t sit quite right? No problem! If your frames are made from acetate, you can make quick, easy adjustments at home in just minutes.
Acetate is both durable and flexible, which means it’s easy to reshape for a better fit. With just a bit of warmth and a few simple steps, you can have your sunglasses fitting comfortably and securely.
Acetate reacts to heat, so simply warming the arms (temples) of your sunglasses with your hands for a few seconds can make them more flexible and easier to adjust.
Use a Hairdryer for More Flexibility
At home (acetate frames only): If your sunglasses have acetate temples (the arms), you can carefully dip just the ends into a glass or cup of warm, not boiling water for 30–60 seconds. This softens the material slightly. Then gently bend the back part of the temples (the section that hooks behind your ears) inward. This small adjustment usually stops slipping and makes them a perfect fit.
⚠️ Important: Do not try this with polycarbonate or metal frames, as they can snap or warp.
Optician help: If you’re unsure, most opticians will happily make quick adjustments for you.
Extra grip: Silicone nose pads or temple sleeves can also help keep your frames secure.
If hand warmth isn’t quite enough, a hairdryer on a low setting can do the trick. Keep the dryer a few inches away from the frame and move it around to heat evenly. Once the acetate softens slightly, you’re ready to shape it.
If your sunglasses feel like they’re slipping off, you can gently bend the arms inward for a snugger fit.
Here’s how:
If your glasses slide down your nose or don’t stay behind your ears, the arms may be too straight. A small bend at the ends can make a big difference.
To fix this:
Personalising the fit of your acetate sunglasses is quick, safe, and makes a big difference in comfort. Take a few minutes to adjust them and enjoy a perfect, custom fit that stays put all day.
Important: If sunglasses are adjusted from the manufacturers standard design template, they are no longer returnable.
This usually happens when sunglasses sit too tightly on the bridge of your nose or the nose pads press down too firmly. A few things can help:
If your sunglasses are acetate with molded nose rests, you may simply need a slightly larger frame next time.
Sliding usually means the frame is a little too wide for you. You can:
Pinching happens when the temple arms curve in too sharply. To fix this:
Do your sunglasses feel a little too loose, oversized, or maybe the arms don’t sit quite right? No problem! If your frames are made from acetate, you can make quick, easy adjustments at home in just minutes.
Acetate is both durable and flexible, which means it’s easy to reshape for a better fit. With just a bit of warmth and a few simple steps, you can have your sunglasses fitting comfortably and securely.
Acetate reacts to heat, so simply warming the arms (temples) of your sunglasses with your hands for a few seconds can make them more flexible and easier to adjust.
Use a Hairdryer for More Flexibility
At home (acetate frames only): If your sunglasses have acetate temples (the arms), you can carefully dip just the ends into a glass or cup of warm, not boiling water for 30–60 seconds. This softens the material slightly. Then gently bend the back part of the temples (the section that hooks behind your ears) inward. This small adjustment usually stops slipping and makes them a perfect fit.
⚠️ Important: Do not try this with polycarbonate or metal frames, as they can snap or warp.
Optician help: If you’re unsure, most opticians will happily make quick adjustments for you.
Extra grip: Silicone nose pads or temple sleeves can also help keep your frames secure.
If hand warmth isn’t quite enough, a hairdryer on a low setting can do the trick. Keep the dryer a few inches away from the frame and move it around to heat evenly. Once the acetate softens slightly, you’re ready to shape it.
If your sunglasses feel like they’re slipping off, you can gently bend the arms inward for a snugger fit.
Here’s how:
If your glasses slide down your nose or don’t stay behind your ears, the arms may be too straight. A small bend at the ends can make a big difference.
To fix this:
Personalising the fit of your acetate sunglasses is quick, safe, and makes a big difference in comfort. Take a few minutes to adjust them and enjoy a perfect, custom fit that stays put all day.
Important: If sunglasses are adjusted from the manufacturers standard design template, they are no longer returnable.
This usually happens when sunglasses sit too tightly on the bridge of your nose or the nose pads press down too firmly. A few things can help:
If your sunglasses are acetate with molded nose rests, you may simply need a slightly larger frame next time.
Sliding usually means the frame is a little too wide for you. You can:
Pinching happens when the temple arms curve in too sharply. To fix this:
