Cycling Sunglasses photochromic from an extremely light and highly resistant TR90 material. Lenses automatically darken / lighten according to the intensity of sunlight. Lenses are almost unbreakable and enables air flow through lenses which protects sunglasses from fogging. Antislip tips and nosepads prevent slip of sunglasses. 100% protection against UV radiation A, B, C guarantee. Sun filter category 1-3.