Smith IO Snow GogglesThe I O combines a wider field of view, innovative Responsive Fit frame design, and updated looks, all while using your same proven lens. The spherical lens has 5X antifog, Smiths highest level of anti fog technology, and TLT optics for crystal clear vision. The original I O was the first goggle to solve the problem of what to do when changing light and weather demanded different lenses. The new I O continues that legacy of uncompromising performance.