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 lenses in the Native Bolder Polarized Sunglasses incorporate a polarized filter, which absorbs the horizontal light, thus eliminating the glare. A set of Sport Flex lenses, for low light conditions, is included. Fits large faces. Double Snap Back interchangeable lens system. 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 lenses. Hard case included.