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Leatt · MTB 4.0 V21

Leatt MTB 4.0 V21

DOT, ECE 22.05

About the Leatt MTB 4.0 V21

Full Face

Dominate the trail with the Leatt MTB 4.0 V21, a full-face helmet engineered for riders who demand uncompromising safety and aerodynamic efficiency. Designed specifically for mountain biking, this helmet features an advanced MIPS technology layer that rotates independently of your head to dissipate rotational energy during glancing blows, significantly reducing the risk of concussions. The sleek, aggressive profile cuts through the air, minimizing drag at high speeds while the integrated visor shields your eyes from debris and sun glare. With a secure fitment system and premium ventilation channels, you stay cool and focused regardless of the terrain's intensity. Whether navigating technical descents or cruising open trails, the MTB 4.0 V21 offers the perfect blend of protective engineering and modern style.

DOT, ECE 22.05 Intermediate Oval MTB 4.0 V21 Family Carbon Fiber 2 year warranty Mid Range

Technical Analysis

The Leatt MTB 4.0 V21 utilizes a multi-density EPS liner and an integrated MIPS system to manage rotational forces during high-impact crashes. Its aerodynamic shell design reduces wind turbulence at speed, while the adjustable visor mechanism ensures consistent optical clarity without compromising structural rigidity.

Safety & Aero-Acoustics HUD

Awaiting SHARP Audit

SHARP impact test results pending.

Aero-Acoustics 82 dB

Extremely Quiet: Superior long-distance sound damping.

Ventilation Flow 6/10

Good Flow: Standard EPS exhaust ports.

Double D-Ring 🔊 Comms Ready

Visor Features

Pinlock Ready Optically Correct
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Where to buy

Best price $299.99 Amazon

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Certified Leatt Stores in US

Price History

Part numbers

Product style MFR. product # SKU Availability
Matte Black / LEA-MTB4-MBK instock
Gloss Red / LEA-MTB4-RED instock
Carbon / LEA-MTB4-CAR instock

Interactive Size & Fit Finder

Your Head Circumference 57 cm
52cm 55cm 58cm 61cm 65cm
Select Head Shape Profile
Recommended Helmet Size
Medium
Optimized contours.
Perfect for standard intermediate head profiles.

Leatt MTB 4.0 V21 is a full-face helmet designed for mountain biking with an extended rear coverage for better protection against impacts from above and behind.

How to measure

Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, and repeat for consistency.

Available Colors & Graphics

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