Expertly designed for MX and Enduro riding, the S-M3 Radium is a lightweight off-road helmet engineered for optimized impact protection and rider comfort. Featuring a thermo-injected shell with a patented low-friction coating and a multi-density EPS liner, it effectively manages rotational acceleration and oblique impact forces. The helmet includes a patented visor release system, integrated hydration tube channels, and an emergency release system for maximum safety.

Key features

Advanced Shell Construction: Features a thermo-injected shell with a specialized polymer blend and engineered thickness to provide the optimal balance of lightweight performance and impact protection (1430g ECE / 1460g DOT).
Maximized Ventilation: Equipped with 10 intake and seven exhaust ports to ensure high levels of heat transfer and airflow during intense riding.
Rotational Acceleration Force Protection: Utilizes a patented low-friction coating on the inner EPS liner that acts as a slip plane to reduce rotational forces during oblique impacts, mimicking the brain's natural defenses.
Patented Visor Release: Designed to release the visor with a pre-determined force during an impact, effectively reducing stress and potential injury to the rider's neck.

Protection

Engineered to meet Alpinestars' rigorous in-house standards for chin bar impact performance, exceeding basic homologation requirements.
Optimized shell thickness and structure specifically designed for superior impact protection in the chin area.
Engineered inner and outer surfaces designed to minimize the physical effects of oblique impacts.
Equipped with an Emergency Release System and removable 3D contoured foam cheek pads for safe and easy helmet removal by trackside medical staff.
Features a 25mm soft textile chin strap for maximum security and rider comfort.
Stainless steel D-rings ensure a consistent, tight, and secure fitment.
Fully certified to ECE 22.06 homologation and DOT standards for global use.

Construction

Shell thickness and structure optimized in the chin area for superior impact performance, exceeding Alpinestars' internal testing standards.
Inner and outer surfaces engineered to minimize the effects of oblique impacts.
Equipped with an Emergency Release System and removable 3D contoured foam cheek pads for safe helmet removal.
Soft textile 25mm chin strap for optimal safety and rider comfort.
Stainless steel D-rings for a tight and secure fit.
Conforms to DOT certification and ECE 22.06 homologation for worldwide use.