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 Superior optical clarity and vision Engineered goggle system aggressively combats fogging Compatible with Klim Off-Road helmets and most Moto-Style helmets Pro version includes outriggers, air force induction, wider strap, nose guard & Tear-Offs