Leatt mtb 4.0 helmet endurodelivering full face protection, the leatt mtb 4.0 helmet enduro is renowned for its ventilation, comfort and is packed full of unique features.push the limits with the helmets 360 degree turbine technology. This unique technology reduces both rotation acceleration and concussion level impact energy to your head and brain.the mtb 4.0 helmet enduro is packed full of useful and protective features. A removable mouthpiece in the chin bar increases ventilation or can be installed to protect you when riding in poor weather conditions. Meanwhile, a universal sunglasses dock lets you safely dock your sunglasses under the visor when not in use, protected from scratches and unwanted prints. The helmet also has an adjustable visor, which opens enough to place your goggles underneath, so you dont have to constantly remove them.specificationsweight from 810g 1.7 lbssizing s 51 55cm ndash 20 21 5frasl8rdquo, m 55 59cm ndash 21 5frasl8 23 1frasl4rdquo, l 59 63cm ndash 23 1frasl4 24 3frasl4rdquocertified and tested as nzs 20632008, astm f1952ndash10, en1078, cpsc 1203featuresdh certified lightweight polymer shell in three sizesremovable chin bar with easy fit stainless attachment systembrain injury reduction technologyreduces forces associated with concussionsunglasses dock port for easy, secure storagein moulded eps epp impact foam for superior energy absorptionmaximised ventilation with 18 ventsoptimised for riding and effective even at low speedsfidlock magnetic closure systemmoisture wicking, breathable, anti odour and washable inner lineroptimal neck back compatibilityadjustable visor with breakaway function for rotational impact force reduction360 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.