Lightweight DH-certified helmet M-Forge carbon shell with composite chinstrap, available in two shell sizes Maximum ventilation with 22 vents Removable ventilation cover for mouthpiece Double-D buckle closure 360° Turbine technology Reduces peak brain acceleration by up to 30% at impact speeds associated with concussion Anti-humidity Dri-Lex® interior lining, breathable, anti-odour and washable Optimal neck guard compatibility Visor with Breakaway function to reduce rotational forces in the event of impact Moulded EPS + EP0 shock-absorbing foam for superior energy absorption Estimated weight : 750 ± 50 g (1.65 lbs)Certified and tested: AS/NZS 2063:2008, ASTM F1952-15, EN1078, CPSC 1203 Size #S (55-56cm - 21 5⁄8 - 22") #M (57-58cm - 22 ½ - 22 ¾") #L (59-60cm - 23 ¼ - 23 5⁄8") #XL (61-62cm - 24 - 24 ½")