All-mountain MTB helmet with certified DH protection, Turbine 360° technology, 18 vents, Fidlock magnetic closure and removable visor. Ideal for challenging trail riding and e-bikes.

LEATT AllMtn 4.0 MTB Helmet — Certified DH protection for demanding trail riding and e-MTB

The LEATT AllMtn 4.0 MTB Helmet in stealth black/grey pushes the boundaries of protection by offering DH homologation in an open and breathable design. Designed for riders tackling the most technical trails, it also meets the requirements of e-MTB riding thanks to its NTA 8776 certification (up to 45 km/h). Lightweight, ventilated, and with a refined finish, it stands out as the ideal companion for demanding rides.

Construction and materials

The polymer composite shell combines structural rigidity and lightness. The interior combines molded EPS and EPO foams that work together to absorb impact energy with superior efficiency. This dual-density architecture guarantees robust protection without adding weight, resulting in a helmet you'll forget you're wearing, even after long hours of riding.

360° Turbine Technology

At the heart of the AllMtn 4.0 is Leatt 's exclusive Turbine 360° technology, which forms a unique 3-in-1 security system on the market:

• Rotational protection : Ingeniously designed "turbine" discs allow slight movement of the helmet on the head at the moment of impact, thus reducing the maximum acceleration transmitted to the head and brain.
• Low speed protection : 360° Turbine technology effectively absorbs the energy of low-velocity impacts.
• High-speed protection : combined with EPS/EPO impact foam, it ensures optimal absorption during the most violent impacts.

This trio of protections covers the entire spectrum of situations encountered on the ground, from minor piloting errors to the most serious falls.

Ventilation

With its 18 carefully positioned vents , the AllMtn 4.0 ensures efficient airflow even at low speeds. This constant flow keeps your head cool during demanding climbs and fast descents, without ever compromising the structural integrity of the shell.

Comfort and fit

The Fidlock magnetic closure allows you to fasten or unfasten the chin strap with one hand, even while wearing gloves. The micrometric buckle occipital retention system offers precise, personalized adjustment for optimal stability regardless of head shape, while the Flat Lock strap divider keeps the chin strap perfectly in place. The inner lining is breathable, odor-resistant, and washable, with active moisture-wicking for lasting comfort. Integrated sunglasses slots allow for easy and secure storage. The adjustable and detachable visor adds extra protection against rotational impacts in the event of a fall and adapts to changing terrain conditions.

Certifications

The AllMtn 4.0 meets the most demanding safety standards in the industry:

• AS/NZS 2063:2008 — Australian/New Zealand bicycle standard
• EN1078 — European standard for cycling helmets
• CPSC 1203 — American bicycle safety standard
• ASTM F1952-15 — Downhill Mountain Bike (DH) certification
• NTA 8776 — certification for electric mountain bikes up to 45 km/h

Product information

• Brand : Leatt
• Product Range : Mountain Bike Helmets
• Gender : Male - Unisex
• Sizes : S (51-55 cm) / M (55-59 cm) / L (59-63 cm)