All conditions lens - designed to perform under the widest spectrum of light and weather conditions. After years of extensive field tests we came to understand that it was not a matter of light transmission, but instead of contrast and definition. Our STEALTH REFLECT lenses feature a contrast and definition enhancing tint that provide unique performance in any condition, from fog and flat light to bluebird, all the way to dark afternoons and snowy days. All this while providing effective UVA protection even on the brightest days on the glacier. Blocks 100% of all harmful UVA, UVB, and UVC rays.