Leatt AllMtn 4.0 Bike Helmet Description The AllMtn 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 360Adeg 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 AllMtn 4.0 is built for riders pushing the limits. Features SHELL: Lightweight polymer shell3-IN-1 SAFETY SYSTEM: When combined with the impact foam, 360Adeg Turbine Technology offers a unique 3-in-1 safety system by protecting against low-speed impacts, high-speed impacts, and rotational forces.IMPACT FOAM: In-molded EPS + EPO impact foam for superior energy absorptionTURBINES: 360Adeg Turbine Technologya Rotation protection: The optimally designed turbine discs enable the helmet to move slightly on the head upon impact, helping to reduce peak acceleration to the head & brain.a Low impact protection: The special energy absorbing material in the turbines absorbs low impact energy associated with concussion.VENTILATION: 18 vents effective even at low speedsLINER: Moisture wicking, breathable, anti-odor and washable inner linerFIT SYSTEM: Flat Lock Strap divider and fit system developed for custom fit, ease, and comfortCLOSURE: Fidlock magnetic closure systemVISOR: Adjustable visor with breakaway function for rotational impact force reductionOTHER FEATURES: Sunglasses dock port for easy, secure storage a Soft touch and moisture wicking chin straps a Plastic-free packagingWEIGHT: From 430g (0.95 lbs)