* Polymer Compound shell in three sizes* MaxiFlow impact foam air channels effective even at low speed* 360° Turbine Technology* Reduced peak brain acceleration by up to 30% at impact speeds associated with concussion* Reduces peak brain rotational acceleration by up to 40%* Extended rear coverage for added protection* Adjustable visor with breakaway function for rotational impact force reduction* In-molded impact foam for great energy absorption* Maximized ventilation with 14 vents effective even at low speeds* Moisture wicking, breathable, and washable inner liner* Certified and tested: AS/NZS 2063:2008, EN1078, CPSC 1203* Weight: from 320g (0,70 lbs)* Plastic Free Recyclable Packaging* Sizing: * 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'')