Leatt: DH CERTIFIED REMOVABLE CHIN BAR HEAD AND BRAIN PROTECTION Renowned for its ventilation and comfort, this enduro MTB helmet has been advanced from the much loved 4.0 full face helmet The heart of the the Enduro 4.0 is the structurally sound, and easy to operate, removable chin bar design, but the adaptability goes much deeper. A removable mouthpiece in the chin bar increases ventilation or can be installed to protect you when riding in poor weather conditions. A universal sunglasses dock lets you safely dock your sunglasses under the visor when not in use, protected from scratches and unwanted impacts. And the adjustable visor extends enough to place your goggles underneath, so you don’t have to constantly remove them This fully ASTM DH certified helmet is the go-to helmet for enduro riders. Uphill or downhill, E-bike or trail - you name it, the Leatt 4.0 Enduro helmet has you covered. The full-face design with removable chin bar with an incredible strong magnesium lock offers outstanding ventilation and its convenient Fidlock® buckle is easy to operate even when your fingers are cramping with arm pump We all crash. Sometimes hard, and sometimes even harder! All Leatt helmets feature 360 Turbine Technology. This design utilizes a network of small discs constructed of a non-Newtonian, energy-absorbing material. Because these Turbines can move 360 (omnidirectional), this technology has two exclusive advantages: namely the reduction of rotational acceleration to the head and brain and the absorption of energy upon impact at concussion level. DH certified lightweight Polymer shell Removable chin bar with NEW easy-fit attachment system Sunglasses dock port for easy, secure storage 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% Maximized ventilation with 18 vents. Optimized for riding and effective even at low speeds Moisture wicking, breathable, anti-odor and washable inner liner Optimal neck brace compatibility Adjustable visor with breakaway function for rotational impact force reduction In-molded EPS + EP0 impact foam for superior energy absorption Certified and tested: AS/NZS 2063:2008, ASTM F195210, EN1078, CPSC 1203 Weight: From 810g (1.79 lbs) Sizing #S (51-55cm 20-21 5⁄8") #M (55-59cm 21 5⁄8- 23 1⁄4") #L (59-63cm 23 1⁄4 - 24 3⁄4")