The Klim Viper/Viper Pro redefines the riding experience on the trail. The Viper is engineered to provide the best optical clarity, vision, field of view (F.O.V.) and fit experience. Ventilation and moisture management systems aggressively combat fogging. Integrating a super-thin frame design, the Viper is compatible with a wide range of open-face helmets. Features FOV + frame geometry for maximum field of view Polycarb UV 400 single lens 100% UVA & UVP protection Fogtech HD anti-fog lens coating Triple layer breathable face foam Includes premium cleaning cloth/storage bag 3 post tear-off system