This helmet was designed specifically for the needs of today´s endurance offroad riders - from short track XC racing to epic gravel adventures.This sleek new helmet was designed in Leatt´s world-class test lab and raced to victory at the highest levels in gravel and cross country with Speedcompany racing.Head and brain protection is serious business, so Leatt urges riders to look beyond a helmet´s sleek exterior and learn more about what´s inside.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.Cover your miles in confidence with the Leatt MTB Endurance 4.0 helmet.MAIN FEATURES.- PowerBridge in-molded force absorber.- Fidlock magnetic closure system.- Eyewear docking port with anti-slip function.- MaxiFlow air channels optimized for high speed.- In-molded impact foam for great energy absorption.- Maximized ventilation with 23 vents.- Strap divider and fit system developed for custom fit, ease and comfort.- Soft touch and moisture wicking chin straps.- Moisture wicking, breathable, anti-odor and washable inner liner.- Lightweight Polymer Compound shell in three sizes.- Certified and tested:EN1078, CPSC 1203, ASTM F1447.- 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%.- Weight:from TBC.- Sizing:S (51-55cm - 20-21 58´´´´) - M (55-59cm - 21 58 - 23 14´´´´) - L (59-63cm - 23 14 - 24 34´´´´).