Revolt's two included lenses cover a wide range of light, from flat mornings to bright afternoons, and the Sario MIPS Helmet's Stack Vent keeps that lens clear no matter which one is in. The vent lines up directly over Revolt's own vent, clearing warm air at the source while Vivid lens technology with Zeiss optics sharpens contrast against the snow. What Our Gearhead(R) Experts Are Saying:"I swap between Revolt's two lenses as the light shifts, and the Sario MIPS keeps the fog away through every change, whiteout to bluebird."