#D SUN - Sunglasses Tortoise Mirror The sun emits visible and invisible electromagnetic waves. The most harmful are UV rays which remain dangerous even in overcast conditions because clouds absorb at most 10% of it. Sun lenses cat. 3 UV rays damage the eye cells. With time, the renewal will be done less and less well. The SUN glasses provide adapted protection with 100% UV category 3 lenses which protect from glare and filter 100% of ultraviolet (UV) rays. Flex hinges Flexible and comfortable arms, with spring hinges, which adapt to all face shapes and sizes.