When youre wearing Julbo goggles that enhance contrast and protect your eyes from UV rays and wind, its easy to enjoy skiing! Modern technology allows photochromic lenses to adapt to all conditions. The lenses of Julbo Cyrius X glasses boast impressive features: the Reactiv High Contrast lens adapts its light transmission to conditions, ranging from 7% to 80%. Reactiv technology responds only to UV radiation, not to temperature. Just like the Julbo Cyrius goggles, the Cyrius X model also features a wide frame, but the X version comes with a double lens. This, combined with Julbos Air Flow ventilation, helps prevent the lens from fogging. The first two product images display the extremes of the lense's darkness and brightness. - AirFlow ventilation - Anti-fog coating - Two different densities of foam help the glasses conform to the shape of your face - The variable tint of the lens covers all categories: Cat 0, Cat 1, Cat 2, Cat 3, and Cat 4