Classic and comfortable, Krones sunglasses by Optic Nerve are lightweight and block harmful UV rays. Durable polarized lenses are great for use on or around water for protection from glare. 100% UV protection A,B,C. Fit medium face shapes. Grey lens tint offers a true, accurate color definition, but no definition or contrast properties. 15% light transmission recommended for intense, abundant sun conditions. Four Point frame fit engineering ensures a well balanced, secure, comfortable fit. Proprietary carbon scratch coating adds durability to the lens. Durable carbon polarized lens ensures uniform curvature, optical clarity, and enhanced thermal stability. Polarized lens technology reduces glare from reflected light recommended for bright sun and variable light conditons especially on or around water. Durable TR90 grilamid nylon resin frame for a snug, consistent fit. Includes soft case with key clip.