You can find measurement A/B/C printed on the inside of the temple arm or on the nose pads.
If you already have a pair of glasses that you like, you can compare measurements to see how a certain style of ours will fit you.

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Carrera’s new Teen collection captures young generations with its signature details — evident in these aviator sunglasses. The storied silhouette is shaped from lightweight metal and reimagined in a new-season colourway. Carrera’s signature ‘C’ logo at the temples and the strategically positioned Flag motif complete the unique feel.
Teenage unisex navigator sunglasses
Lightweight full-rim frames sculpted from gold-tone stainless steel, long acetate end tips
Rx-able gray mirrored polycarbonate lenses
Signature ‘C’ at the temples, strategically positioned Flag motif
Adjustable silicone nose pads ensure a personalized fit
Complimentary storage pouch – exclusive to the Carrera Teen range