Frequency - made to work with both no headwear, and with different kinds of helmets. They offer a wide, panoramic view. Despite looking quite light, the lens in this model is actually a cat3 lens, with a visible light transfer of just 12% - great protection, but still suitable for use in traffic. - Frame size suitable for most adults - Controlled ventilation in the upper part of the lens - Grip Tech temple material offers a solid hold, without sticking to your hair - Soft nose pad - Lens height 49 mm, width 130 mm - Base 5 - Bridge 13 mm - Temple 123 mm Julbo has been making sunglasses for more than 135 years. By buying Julbo, you are investing in a quality product and can rest assured the glasses offer perfect UV protection.