Bolle Ecrins Sunglasses, Polarized TNS Gun AF, Crystal Smoke Anti-slip nose piece Anti-slip temples Frame venting System Wrapped temples Optical class 1 with 100 percent UV Protection Our polarized lenses align light rays from the sun, giving you a crystal clear view at all times Precision frame venting technology helps prevent moisture build up no matter what the weather The only prescription program which ensures optimum precision, comfort and frame balance for sports sunglasses