Leatt MTB Gravity 1.0 Men Full Face Helmet Fire XL 61-62cmDownhill certified ASTM polymer shell in three sizes Superior ventilation 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%breakaway visor function for additional rotational impact force reduction Impact foam for superior energy absorption Moisture wicking, breathable and washable inner liner Optimal neck brace compatibility Certified