Polymer Compound shell in three sizes Brain injury reduction technology Reduces forces associated with concussion MaxiFlow impact foam air channels effective even at low speed 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 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% Weight: from 320g (0,70 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”)