Leatt Men's MTB 1.0 Gravity Protection Helmet

Downhill certified ASTM polymer shell in three sizes Great 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 Double D ring chin strap Impact foam for superior energy absorption Washable inner liner Optimal neck brace compatibility Certified and tested: AS/NZS 2063:2008, ASTM F1952–10, EN1078, CPSC 1203 Weight: From 960 ± 50g (2.12 lbs) Sizing #XS (53-54cm – 20 ¾ - 21 ¼) #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) #XXL (63-64cm – 24 ¾ - 25 1? 5)