Ryders Swamper Photochromic Sunglasses Photochromic Effect - Automatically Adjusts From Light to Dark and Vice Versa to Suit Light Conditions UV Protection - Protect Against 100% UVA, UVB, UVC and Harmful Blue Light to 400nm Optically Correct And Hardened Lenses Ultra Light And Durable Frame Material Anti-Slip Technology By The Nose