Five steps up from your standard trail helmet!A lightweight all-purpose MTB helmet for trail riding, cross country training and back country orgravel adventures. This helmet is well ventilated with maxiflow air channels and the Dri-Lex® liner is washable, moisture wicking, anti-odor and breathable. What is most important about the Leatt MTB 2.0 helmet is the head and brain protection level itoffers. Featuring 360 Turbine Technology, the helmet is lined with turbines which are 360 ̊movingdiscs constructed from an energy-absorbing foam and material. This tech has two exclusiveadvantages, namely the reduction of rotational acceleration to the head and brain and theabsorption of energy upon impact at concussion level.Be comfortable and ride safe. Lightweight Polymer Compound shell in three sizesBrain injury reduction technologyReduces forces associated with concussionMaxiFlow impact foam air channels effective even at low speedIn-molded impact foam for great energy absorptionMaximized ventilation with 20 ventsVisor with breakaway function for rotational impact force reductionDri-Lex® moisture wicking, breathable, anti-odor and washable inner linerCertified and tested: AS/NZS 2063:2008, EN1078, CPSC 1203360° Turbine TechnologyReduced peak brain acceleration by up to 30% at impact speeds associated with concussionReduces peak brain rotational acceleration by up to 40%Weight: from 300g (0.65 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”)