* Downhill certified ASTM polymer shell in three sizes * 360deg 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% breakaway visor function for additional rotational impact force reduction * Impact foam for superior energy absorption * Premium washable inner liner for all-day comfort * Optimal neck brace compatibility * Certified and tested: AS/NZS 2063:2008, ASTM F1952-10, EN1078, CPSC 1203 * Weight: 960 50g (2.12 lbs) * Sizing: XS (53-54cm - 20 3/4 - 21 1/4"), S (55-56cm - 21 - 22"), M (57-58cm - 22 1/2 - 22 3/4"), L (59-60cm - 23 1/4 - 23"), XL (61-62cm - 24 - 24 1/2"), XXL (63-64cm - 24 3/4 - 25")