Zol Window Photochromic Sunglasses

100% UV protection, with a Cat. 0% shade Clear to Cat. 3% Sun. Photochromic Changing Conditions. Lightweight frame. Polycarbonate lens. One year warranty directly with manufacturer. 30-day return or exchange policy Includes microfiber pouch for safe storage and cleaning The Zol Window photochromic sunglasses have an optical lens that darkens on exposure to light of sufficient high frequency, most commonly ultraviolet (UV) radiation. In the absence of the activating light, the lenses return to their clear state. This is a lightweight sports frame that fits medium to large faces. The lens provides 100% UV protection, with a Cat. 0% shade to Cat. 3% sun.