MTB ALL-MTN 4.0 HELMET Discover the pinnacle of mountain biking. Leatt’s all-new MTB All-MTN 4.0 helmet is created for those who venture where the air is thinner and the trails are tougher. Whether you're a traditional mountain biker or an eBiker enthusiast experience a helmet that seamlessly fuses style with cutting-edge protection embodying the spirit of alpine adventure The ultra-stylish design is not just about looks - the helmet houses 360° Turbine Technology significantly reducing brain acceleration during impacts. The features include an adjustable visor and sunglasses dock port making it the perfect companion for high-altitude escapades. Enjoy all-day comfort mountain-ready durability and unmatched functionality in one helmet. Dive into the new age of mountain biking with the MTB All-MTN 4.0. Lightweight Polymer shell 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% Adjustable visor with breakaway function for rotational impact force reduction Maximized ventilation with 18 vents. Optimized for riding and effective even at low speeds Moisture wicking breathable anti-odor and washable inner liner In-molded EPS + EP0 impact foam for superior energy absorption Certified and tested: AS/NZS 2063:2008 EN1078 CPSC 1203 ASTM F1952-15 Weight:From 430g 0.95 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"