Glare is reflected light that travels on a horizontal plane. Virtually any surface can be a source of glare, including water, sand, pavement, ice and snow. The Native Wazee Reflex Polarized Sunglasses feature polarized lenses, with Reflex? technology for increased glare reduction and enhanced styling. Polarization absorbs the horizontal light, thus eliminating glare. A set of Sport-Flex lenses, for low light conditions, is included.Fits large faces. Double Snap-Back? interchangeable lens system. Reflex lenses offer superior glare reduction and improved looks. Polarized lenses eliminate glare. Crystal carbonate lenses are impact resistant and block 100% harmful UV (ABC). Rhyno-Tuff? air frames weigh less than 1 oz. Venting above lenses to prevent fogging. Cushinol? nose pads for a comfortable secure fit. Cam action hinges. Mastoid temple grip. Anti-ocular intrusion system to impact protection. Includes sport-flex (low light) lens. Hard case included.