The motocross goggles is smaller and the ski goggles is bigger. The motocross goggles with No fog - proof function. Ski goggles: double lens, better anti-fog performance, but are dark lenses, used in cloudy or low light conditions. The racing goggles: single lens, lighter overall weight, transparent, brightening, colored coated lenses, etc., you can choose different lenses according to the brightness of riding environment illumination. And also the tear off film can be interchanged when the films are dirty.