Engineered specifically for bespectacled skiers and snowboarders, the Index 2.0™ features sophisticated over-the-glasses technology for extra comfort, including a finely crafted interior with extra volume to better accommodate prescription frames. Increased air volume inside the goggle keeps your vision crisp, clear, and fog free. The Index 2.0’s lens also offers premium clarity thanks to its incorporated VIVID Technology with Optics by ZEISS®. OTG – Over-the-Glasses Technology. Temple cutouts for eyeglass frame arm pieces. OTG Frame. Injection-molded cylindrical lens. Double layer face foam with microfleece facing. Seamless Compatibility with all Giro helmets. Anti-fog coating.