Features include industry standard polycarbonate shell that is DOT and SNELL approved. Everclear no-fog face shield: interior coating offers crystal clear vision even in cold conditions. Speedshift quick-change face shield system: simple turn knobs that allow for tooless shield changes in seconds. Kwikwick moisture-wicking liner: removable & washable liner fabric pulls unwanted moisture away from you. Aero-tuned ventilation system: adjustable intake & exhaust ports force hot air out of helmet. Specify size in comments when ordering.