Leatt mtb 8.0 helmetdelivering high performance safety and a comfortable fit, the leatt mtb 8.0 helmet is a full face helmet that is astm certified and incredibly affordable.the mtb 8.0 helmet lets you push your limits with leatts unique 360 degree turbine technology. The technology reduces both rotation acceleration and concussion level impact energy to your head and brain. The helmet is also astm and motorcycle ece certified ensuring the ultimate in protective design.the pro fit modulating comfort liner stretches over your head to provide superior comfort and stability, even on the roughest terrain.specificationsweight from 1250g 2.7 lbssizing s 55 56cm ndash 21 5frasl8 22rdquo, m 57 58cm ndash 22 frac12 22 frac34rdquo, l 59 60cm ndash 23 frac14 23 5frasl8rdquo, xl 61 62cm ndash 24 ndash 24 frac12rdquocertified and tested astm f1952ndash10, en1078, cpsc 1203, as nzs 20632008. Motorcycle ece 22.05featuresbrain injury reduction technologyreduces forces associated with concussionmotorcycle impact certificationincredible comfort due to profit modulating comfort linerimpact absorbing foam in 4 custom densities for ultimate reduction of forces to head and brainmoisture wicking, breathable, anti odour and washable liner fabricoptimal neck brace compatibilitymaximised ventilation effective even at very low speedsvisor with breakaway function for rotational reduction in a crashemergency cheek pad removalhydration ready with optional hands free kit360 degree turbine technologyreduced peak brain acceleration by up to 30% at impact speeds associated with concussionreduces peak brain rotational acceleration by up to 40%buy leatt helmets from chain reaction cycles, the world's largest online bike store.