The Zol Sky photochromic polarized sunglasses have an optical lens that darkens on the exposure to light of sufficient high frequency, most commonly ultra violet (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 provide 100% UV protection and are polarized. An adjustable rubber nose piece helps keep the frame in place and enhances the fit. One year warranty directly with manufacturer. Includes a microfiber case to clean and store the sunglasses.