Leatt AllMtn 4.0 MTB Helmet

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 deg. 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 shell
• 3-in-1 Safety System: When combined with the impact foam, 360 deg. 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 deg. 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
• 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

Specifications:

• Weight: From 430 g (0.95 lbs)
• Sizes:
  • S: 51 - 55 cm (20" - 21 5/8")
  • M: 55 - 59 cm (21 5/8" - 23 1/4")
  • L: 59 - 63 cm (23 1/4" - 24 3/4")

User Manual

Certification

Turbine Technology Info (1.58 MB)