The Smith I/O X Snow Goggles With Red Sol X/Blue Sensor Lenses has the extra-large spherical lens that allows unparalleled peripheral vision, while 5X anti-fog technology creates five times the fog absorption compared to anything else on the market. This technology combined with the interchangeable lens keeps you on the mountain all day, regardless of the conditions. The floating foam membrane eliminates eyeglass temple pressure allowing you to wear eyeglasses comfortably. The Red Sol X Lens has 17% Visible Light Transmission. Dark sienna brown, Sol-X base lens tint with a multi-layer red mirror cuts glare and reduces eye fatigue in bright, sunny conditions. The Blue Sensor Lens has 60% Visible Light Transmission. Light rose base lens tint with a multi-layer blue sensor mirror maximizes color definition and increases depth perception in varying levels of flat light conditions.