Bolle Fang Sunglasses, Polarized TNS AF, Blue Line Our polarized lenses align light rays from the sun, giving you a crystal clear view at all times The only prescription program which ensures optimum precision, comfort and frame balance for sports sunglasses Our polycarbonate lenses are 20 times more impact resistant than glass and three times lighter Our lenses are enhanced with an armor shell on both sides of the lens, giving you the protection you need from scratches and other damage Thermogrip keeps your glasses on your Face with comfortable, hydrophilic nose pads and temple tips that absorb moisture and keep your sunglasses in place