Serengeti Sortie Sunglasses, Shiny Hematite Frame, Polarized Drivers Lens Photochromic lenses constantly adjust to changing light conditions Spectral Control diminishes haze and distracting glare, enhances contrast and sharpens your vision Polarized - parallel light rays can enter, while distracting perpendicular rays are absorbed 100% UVA/UVB Protectant, Ultra-Light Glass Lenses Titanium Frame and Bayonet Temples