Alpinestars SM3 Radium Helmet

The Alpinestars SM3 Radium Helmet is a lightweight, high-performance off-road helmet engineered for motocross, Enduro, and recreational trail riding. Designed with advanced impact protection, optimized ventilation, and rider-focused comfort features, the SM3 Radium delivers the confidence and performance riders need when tackling demanding terrain.

Features

• Advanced Thermo-Injected Shell: Features a specialized polymer blend with varying shell thicknesses to balance lightweight performance with impact protection.

• Lightweight Construction: The medium ECE version weighs approximately 1430g, while the DOT version weighs approximately 1460g.

• Multi-Density EPS Liner: Five EPS components with four different densities are designed to effectively manage impact energy.

• Rotational Acceleration Protection: A patented low-friction coating on the inner EPS liner is designed to help reduce rotational forces associated with certain oblique impacts.

• Maximized Ventilation: Ten intake ports and seven exhaust ports promote continuous airflow and help transfer heat away from the rider's head.

• Patented Visor Release System: Designed to release the visor at a predetermined force during an impact, helping reduce forces transferred to the rider's neck.

• Enhanced Chin Area Protection: The shell thickness and structure around the chin area are optimized for improved impact performance.

• Emergency Release System: Removable cheek pads allow for easier and safer helmet removal in emergency situations.

• 3D Contoured Cheek Pads: Provide a comfortable, secure fit while supporting the helmet's emergency release functionality.

• Hydration Tube Channels: Integrated channels in the cheek pads make it easier to route a hydration tube for convenient access while riding.

• Moisture-Wicking Comfort Liner: Helps manage moisture and keep the interior more comfortable during intense riding.

• Adjustable Interior Fit: Crown and cheek pads are available in different thicknesses, allowing riders to fine-tune the fit.

• 25mm Soft Textile Chin Strap: Provides secure retention while adding comfort.

• Stainless Steel D-Rings: Offer a dependable and secure closure system.

• ECE 22.06 and DOT Certified: Meets both ECE 22.06 homologation and DOT certification requirements. (Alpinestars)

Applications

• Motocross racing

• Enduro riding

• Dirt bike riding

• Off-road trail riding

• Recreational powersports use

• Track and practice days

Why You'll Love It

The Alpinestars SM3 Radium is built for riders who want advanced helmet technology without unnecessary weight. Its combination of multi-density EPS, rotational acceleration protection, and an optimized shell helps provide a high level of impact management, while the extensive ventilation system keeps air moving during hard rides. The adjustable fit system, removable cheek pads, hydration tube channels, and moisture-wicking liner add everyday convenience and comfort. Whether you're lining up at the motocross gate or exploring the trails, the SM3 Radium is designed to deliver the protection, airflow, and performance needed for serious off-road riding. (Alpinestars)