DH certified lightweight Polymer shell in two sizes Maximized ventilation with 22 vents Removable mouth piece ventilation cover Fidlock magnetic closure system 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% Dri-Lex® moisture wicking, breathable, anti-odor and washable inner liner Optimal neck brace compatibility Visor with breakaway function for rotational reduction in a crash In-molded EPS + EPO impact foam for superior energy absorption Weight: From 850g (1.87 lbs) Certified and tested: AS/NZS 2063:2008, ASTM F1952–10, EN1078, CPSC 1203 Plastic Free Recyclable Packaging Sizing: S (55-56cm – 21 ?†- 22''), M (57-58cm – 22 ½†- 22 ¾â€), L (59-60cm – 23¾†- 23?''), XL (61-62cm – 24†– 24 ½â€) 
