We're no fair-weather shredders, so we love having a variety of lens shades for bluebird days and snowstorms alike. This lens mates with M4 goggles, and its cylindrical shape reduces peripheral distortion, ensuring we have a wide field of vision in addition to the ideal light filtering for the conditions. PERCEIVE technology boosts contrast and clarity, and with smudge-, fog-, and scratch-resistance, our vision is crystal clear.