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 men’s sunglasses bring a cool twist to the classic rectangle-shaped silhouette – courtesy of Carrera’s brand-new ‘grid’ texture that adorns the edges for a distinct, modern finish. Conveniently equipped with adjustable nose pads for comfort and fitted with UV-protective polycarbonate lenses, the result is dependable, practical, and effortless in equal parts – exactly what you’d come to expect from the brand.
Men’s sunglasses with a classic rectangle-shaped profile
Polyamide-injected frames in a dark Havana finish
Carrera’s signature along both arms and on the left lens
Gray polycarbonate lenses
Can be fitted with prescription lenses
Molded nose pads and flex hinges for a secure and comfortable fit
Come in a complimentary storage case