Extreme All-Mountain Head And Brain Protection The most comfortable all mountain helmet with head and brain protection technology money can buy! A universal sunglasses dock lets you safely dock your sunglasses under the visor when not in use, protected from scratches and unwanted impacts. The adjustable visor opens up enough to place your goggles underneath, so you don’t have to constantly remove them. You will also love the convenience of the Fidlock buckle system. Leatt helmets feature 360 ̊Turbine Technology reduces both rotation acceleration and concussion level impact energy to your head and brain! Do not be afraid to push you limits. Gear up and be prepared for whatever is waiting along the trail. Lightweight Polymer Compound shell in three sizesBrain injury reduction technologyReduces forces associated with concussionSunglasses docking port for easy and secure storageMaximized ventilation with 13 vents effective even at low speedsFidlock magnetic closure systemMoisture wicking, breathable, anti-odor and washable inner linerAdjustable visor with breakaway function for rotational impact force reduction360° Turbine TechnologyReduced peak brain acceleration by up to 30% at impact speeds associated with concussionReduces peak brain rotational acceleration by up to 40%In-molded EPS + EPP impact foam for superior energy absorptionCertified and tested: AS/NZS 2063:2008, EN1078, CPSC 1203Weight: From 430g ( 0.95 lbs)Sizing #S (51-55cm – 20-21 5⁄8”), #M (55-59cm – 21 5⁄8- 23 1⁄4”), #L (59-63cm – 23 1⁄4 - 24 3⁄4”)