Designed specifically for mountain bikers, the MTB Main Goggles are designed to be worn with both full-face and 3/4 shell helmets. Ounce-for-ounce, they are the best value on the market, and feature our Variable Lens System (VLS™). VLS™ makes your goggles compatible with both standard lenses (stock) and injection molded lenses (sold separately) within the same frame. With an expansive viewport, triple-layer foam, and tear-off functionality, they are a heavy hitter and light on the wallet.