Icon Airmada Stack High Vis Helmet Ride the Lightning may have put metal up yerass, but the Stack will put thunder in your soul. Boom! As serious as a duo-toned seizure, the Stack riffs a feedback induced hymn of epic loudness. You do not compute, and neither does this graphic. Features Injection molded polycarbonate shell for strength and durability Recessed twin channel supervent with industry leading intake and exhaust ports for increased cooling Fog-free ICON optics shield with PROLOCK shield locking system Adjustable chin and forehead venting system maintains continual temperature for increased comfort in and riding situation Rapid-Release shield change system Removable molded breath deflector helps prevent fogging Fully removable, washable, HYDRADRY moisture-wicking interior Easy adjuster go-vent switch for superior air flow control Available in 4 shell sizes with an ICON exclusive long oval headform for ultimate fit and comfort All World standard meets or exceeds the following DOT FMVSS 218 (US ), ECE 22-05 (EUROPE), SAI AS1698 (AUSTRALIA) SG (JAPAN) safety and testing standards. (Does not ship with SAI or SG Certification stickers unless purchased from an authorized dealer in that country)