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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These sunglasses strike the perfect balance of performance and style. The full-rim navigator frame is sculpted from lightweight stainless steel and fitted with Carrera’s signature Tank hinge, Inspired by the gasoline tank of a cafè racer motorbike. This custom made hinge ensures flexibility and comfort, with a refined design highlighted by Carrera’s distinctive touch of red. If you prefer them as optical glasses, you can swap out the UV-protective lenses for a prescription pair.
Modern navigator sunglasses
Lightweight full-rim frames sculpted from gold-tone stainless steel, havana long acetate end tips
Mirrored blue polycarbonate lenses can be swapped out for a prescription pair
Flexible Tank hinges accented with a touch of Carrera’s signature red, logo lettering on the left lens
Adjustable silicone nose pads ensure a personalized fit
Rx-able style
Come in a complimentary storage case