Leatt Helmet MTB AllMtn 4.0 V26

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 360° 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.

SHELL: Lightweight polymer shell

3-IN-1 SAFETY SYSTEM: When combined with the impact foam, 360° 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 absorption

TURBINES: 360° Turbine Technology

• 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.
• 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 speeds

LINER: Moisture wicking, breathable, anti-odor and washable inner liner

FIT SYSTEM: Flat Lock Strap divider and fit system developed for custom fit, ease, and comfort

CLOSURE: Fidlock magnetic closure system

VISOR: Adjustable visor with breakaway function for rotational impact force reduction

OTHER FEATURES: Sunglasses dock port for easy, secure storage • Soft touch and moisture wicking chin straps • Plastic-free packaging

WEIGHT: From 430g (0.95 lbs)

CERTIFICATIONS: AS/NZS 2063:2008, EN1078, CPSC 1203, ASTM F1952-15, NTA 8776 (Helmets for S-EPAC riders)

CRASH REPLACEMENT: 3-year Leatt Helmet Replacement Program

SIZES:

• S: 51–55 cm (20–21 5⁄8 in)
• M: 55–59 cm (21 5⁄8–23 ¼ in)
• L: 59–63 cm (23 ¼–24 ¾ in)