The short answer: choosing frames comes down to three decisions — shape, size, and material. Match the frame shape to your face by contrast (angular faces suit round frames, round faces suit angular ones). Match the frame size to the width of your face using the numbers printed on the arm. Then pick a material for the weight and look you want. Everything else is style.
This guide is the map. Want the answer in ten seconds instead? Run the free Frame Finder — four questions, and it recommends the shapes that fit you.
1. Shape: match your face by contrast
The one rule that carries most of the work: contrast flatters. Angular faces look best softened by curves; round faces gain definition from angles; oval faces can wear almost anything. Match the frame width to the widest part of your face, and let the top line of the frame follow your brow.
| Face shape | Wear these |
|---|---|
| Round | Square, rectangle, geometric |
| Square | Round, panto, oval, rimless |
| Oval | Almost anything — pick your energy |
| Heart | Round, rimless, light bottom-weighted |
Not sure of your shape? The Frame Finder walks you through it and links straight to the right collection.
2. Size: read the numbers on the arm
Every frame has three numbers printed inside the temple arm — like 52–18–145. They are the lens width, bridge width, and arm length in millimeters. Get these close to a pair that already fits and online sizing stops being guesswork. Full explainer: how to read glasses frame size numbers.
3. Material: weight, durability, and look
Material decides how frames feel on your face and how they read:
- Acetate — rich color and depth, bolder presence, hand-polished. The default for statement frames.
- Metal — thin, light, understated. Titanium and steel flex where acetate snaps.
- Wood — one-of-one grain, warm and light, a genuine talking point.
Full comparison with weight and durability: acetate vs metal vs wood.
Sunglasses or eyeglasses — same rules
Shape, size, and material work identically for both. If you are buying sunglasses, add the one lens decision that actually matters — UV protection — from the complete guide to sunglasses lenses.
From our test bench. We put every frame on real faces before it goes live — round, square, wide, narrow. If a shape only worked on the fit model, it did not make the site. The recommendations across this guide come from that testing, not from a stock chart.
FAQ
How do I know my face shape?
Pull your hair back, look straight into a mirror, and notice your widest feature. Wide cheekbones with a narrow chin lean diamond or heart; a strong jaw as wide as the forehead reads square; length clearly greater than width is oblong; soft equal proportions are round or oval. Or skip the mirror and run the Frame Finder.
What if I am between two shapes?
Most people are. Pick the shape closest to your jawline — it drives the contrast rule — and start there. Frames recommended for both of your shapes are the safest bet.
Does the frame need to match my prescription?
Strong prescriptions do better in smaller frames (thinner edges, less distortion) and in acetate, which hides thick edges better than thin metal. Ask your optician about lens index for high powers.
Free tools: Frame Finder · Shop all frames · Last updated: July 20, 2026
