Leatt Helmet MTB All Mtn 4. 0DH-Certified Protection The Leatt Helmet MTB All Mtn 4. 0 helmet delivers DH-certified protection in a lightweight, open-face design, giving aggressive trail and e-MTB riders downhill-level impact protection. Built with in-molded EPS + EPO impact foam for enhanced energy absorption, it is certified to ASTM F1952-15 (downhill MTB) and NTA 8776 (e-bikes going up to 45km/h / 28 mph) standards, making it an ideal choice for aggressive rides and e-MTB adventures. Leatt's 360deg Turbine Technology helps reduce rotational forces and absorb low-speed impact energy, while the impact foam provides high-speed impact protection, working together as a 3-in-1 safety system. The modern profile meets the highest safety standards, yet it remains lightweight and breathable, with a moisture-wicking liner to manage sweat. A Fidlock magnetic buckle makes for easy one-handed closure, and the adjustable breakaway visor adds another layer of protection in a crash. With a secure fit system, integrated eyewear dock, and sleek design, the All Mtn 4. 0 is built for riders pushing the limits. Features3-in-1 Safety System with impact foam and 360deg Turbine Technology that protects against low-speed impacts, high-speed impacts, and rotational forces18 vents that are effective even at low speeds Adjustable visor with breakaway function for rotational impact force reduction SPECIFICATIONSCore Material EPS + EPO Impact Foam Closure system Leatt Closure System Safety Certifications AS/NZS 2063:2008, EN1078, CPSC 1203, ASTM F1952-15, NTA 8776 (Helmets for S-EPAC riders)Intended Use All-Mountain, Enduro, DHWeight From 430g Sizing Size Small Medium Large Head Circumference (cm)51 - 55cm55 - 59cm59 - 63cm Height (in)20" - 21-5/8"21-5/8" - 23-1/4"23-1/4" - 24-3/4" | Leatt | Helmet Mtb Allmtn 4. 0 Men's | Size Small In Lager Yellow