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. Brown lens tint offers enhanced acuity, definition, and contrast does not dramatically alter color perception. 18% light transmission recommended for general, bright 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. Frame color is demi black as shown in photo.