Leatt Helmet MTB AllMtn 4.0

The Leatt MTB AllMtn 4.0 Helmet is a high-end open-face mountain bike helmet designed for aggressive trail riding, enduro, and e-MTB use. It combines lightweight construction with downhill-level safety features and strong ventilation for long rides.

Overview

• Type: Open-face all-mountain / enduro MTB helmet

• Weight: From about 430 g (0.95 lb) depending on size

• Shell: Lightweight polymer shell with in-molded foam

• Price range: Around $200–$220 new

• Sizes: S (51–55 cm), M (55–59 cm), L (59–63 cm)

Key Features

Advanced Impact Protection

• 360° Turbine Technology: Internal energy-absorbing discs that allow slight movement during impact to reduce rotational forces.

• Designed to reduce brain acceleration by up to ~30% and rotational acceleration by ~40% in certain crash scenarios.

• EPS + EPO dual-density impact foam absorbs both low- and high-energy impacts.

• Certified to several standards including ASTM F1952 (downhill MTB) and CPSC/EN1078 helmet safety ratings.

Ventilation & Comfort

• 18 large vents and internal air channels keep airflow moving even at low speeds.

• Moisture-wicking liner that is breathable, anti-odor, and washable.

• Lightweight construction keeps fatigue low on long climbs or rides.

Rider-Focused Features

• Fidlock magnetic buckle allows easy one-handed fastening and removal.

• Adjustable breakaway visor helps reduce rotational forces in a crash.

• Integrated sunglasses dock for secure eyewear storage when climbing or resting.

Typical Use

This helmet is aimed at riders who want:

• Aggressive trail or enduro riding protection

• A lightweight open-face alternative to full-face helmets

• Safety certifications suitable for high-speed trail riding or e-MTB