The Leatt MTB AllMtn 4.0 in Stealth Black/Grey is a premium open face mountain bike helmet with extended rear coverage, built for cyclists who are tackling bigger mountains and more technical trails. It combines deep coverage and Leatt’s brain protection technology with goggle-friendly features usually found on full face helmets.

This helmet suits all-mountain and enduro cyclists who prefer an open face but want more protection at the back and sides of the head. It is also e-bike rated to NTA 8776, so it is a smart choice if you are spending more time on an e-MTB and covering more ground at higher speeds.

Extended Rear Coverage

The shell sits lower at the back of the head than a typical trail helmet, giving you more protection where it counts on rough descents. EPS and EPO impact foam is in-moulded into the lightweight polymer shell for superior energy absorption.

360° Turbine Technology

Leatt’s 360° Turbine Technology uses small, energy-absorbing discs inside the helmet that can move in any direction on impact. They help reduce head impact at concussion level by up to 30% and rotational acceleration to the head and brain by up to 40%, giving you extra confidence every time you head out.

Goggle and Sunglasses Compatible

The adjustable visor opens up enough to stash your goggles underneath, so you don’t need to keep taking them off on the climbs. A universal sunglasses dock stores your glasses safely under the visor, protected from scratches and knocks.

Cool, Comfortable and Easy to Use

Eighteen vents are optimised to work at slower speeds, and the moisture-wicking liner is breathable, anti-odour and washable. The Fidlock magnetic buckle is simple to use with gloves on, and the visor breaks away in a crash to help reduce rotational forces.

Item specs

• Brand: Leatt
• Model: MTB AllMtn 4.0
• Helmet type: Open face all-mountain MTB helmet with extended rear coverage
• Colour: Stealth Black/Grey
• Shell: Lightweight polymer
• Impact foam: In-moulded EPS + EPO
• Brain protection: 360° Turbine Technology
• Ventilation: 18 vents
• Closure: Fidlock magnetic buckle
• Liner: Moisture-wicking, breathable, anti-odour and washable
• Features: Goggle-compatible adjustable breakaway visor, sunglasses dock
• Weight: From 430g
• Certifications: AS/NZS 2063:2008, EN1078, CPSC 1203, ASTM F1952-22, NTA 8776 (e-bike)
• Sizes: L (59-63cm) head circumference
• Suitable for: All-mountain, enduro, trail and e-MTB cycling