The Alpinestars SM3 Helmet in Radium Red, Red Fluo, and White is engineered for motocross, enduro, and off-road riding. Its thermo-injected shell uses a polymer blend with strategically varied thicknesses to provide a balanced combination of impact protection and reduced weight. The lightweight outer shell is reinforced by a composite fiber layer positioned between the shell and EPS liner, helping manage impact energy while maintaining rider comfort and mobility. This Large helmet is designed for riders who demand dependable protection during aggressive off-road use. Manufacturer: Alpinestars. Vendor part number: 8300826-3216-L. Manufacturer part number: 8300826-3216-L.
The SM3 features a six-piece EPS liner incorporating five densities, with each density positioned to support effective impact absorption in specific areas. A polished inner EPS surface with a low-friction coating helps reduce friction between the EPS liner and comfort liner, supporting rotational impact management during certain oblique impacts. The helmet also includes a visor release system engineered to release at a predetermined force, helping reduce forces transferred to the rider's neck during an impact. Ten intake vents and seven exhaust ports promote airflow and heat exchange, while the visor directs air toward the ventilation channels for improved cooling during demanding rides.
Rider comfort and fit can be tailored with the helmet's crown and cheek pads, supported by 3D-contoured foam for a secure, comfortable feel. The removable cheek pads are compatible with the integrated Emergency Release System, allowing safer and easier removal while the helmet remains in place. Hydration tube channels are built into the cheek pads for convenient off-road hydration system routing. A soft textile chin strap and stainless steel D-rings help provide a comfortable, secure fit. The comfort liner uses recycled materials to help reduce environmental impact without compromising performance. This Alpinestars SM3 Large helmet fits riders seeking a purpose-built MX, enduro, or off-road helmet with advanced ventilation, impact management, and practical trail-focused features.
Features:
- Shell Construction: Thermo-injected polymer shell with varied thickness for optimized impact protection and reduced weight.
- Composite Protection Layer: Composite fiber layer positioned between the outer shell and EPS liner for enhanced impact protection.
- Impact Management: Six-piece EPS liner with five densities to manage impact performance in designated helmet zones.
- Rotational Impact Control: Low-friction coating helps reduce friction and rotational acceleration forces during certain oblique impacts.
- Ventilation: Ten intake vents and seven exhaust ports support airflow and heat transfer during demanding riding.
- Visor Release System: Predetermined-release visor design helps reduce forces transferred to the rider's neck during an impact.
- Custom Fit: Crown and cheek pads allow the fit to be tailored to the rider's head.
- Emergency Release System: Removable cheek pads support safer helmet removal while the helmet remains on the rider.
- Hydration Routing: Integrated cheek-pad channels accommodate hydration tubes for convenient off-road use.
- Secure Retention: Soft textile chin strap and stainless steel D-rings provide a comfortable, secure fit.
- Application: Designed for motocross, enduro, and off-road riding.
- Part Numbers: Manufacturer and vendor part number 8300826-3216-L.