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.

Not available Online
Designed for maximum performance and style, these aviator sunglasses take Carrera’s signature silhouette to new heights. The sleek stainless-steel construction stands out with a double nose bridge and texturized metal spoilers at the sides – the season’s sports-inspired design innovation. Carrera’s trademark Tank hinges provide comfort and flexibility, while a range of UV-protective lenses – including mirrored and photochromic variations – ups the cool factor.
Aviator sunglasses
Stainless-steel front and temples in a dark ruthenium-tone finish, long acetate end tips
Carrera’s flexible Tank hinges, logo lettering on the left lens
Blue polycarbonate lenses with a flash mirrored coating
Can be fitted with prescription lenses
Adjustable silicone nose pads
Come in a complimentary storage case