Bertoni Sports Photochromic Sunglasses for Cycling Running Ski Italy - F308 Frame: flexible Nylon with memory of position - Wraparound design: protects the eyes from wind, splashes and bad weather, provide enhanced peripheral vision Photochromic lenses from light brown to smoke with antifog coating - Sunfilter category from 1 to 3, it adapts to the brightness - Full UV filter Lenses are in impact resistant polycarbonate , easily removable in order to make easier the cleaning operations Grip at the tip of the arm and nosebridge: keeps the sunglasses from slipping vented lenses: prevents and reduces fogging