Item Condition: This item is missing: Missing peak visor and original manufacturer box. Helmet repackaged in generic box and in good condition. Peak visor can be purchased on our website.

Alpinestars SM3 Radium Helmet

For off-road riding, the Supertech M3 Helmet stands as a value-driven choice well-suited for MX, enduro, and various recreational terrains. This helmet is designed to excel under challenging conditions, featuring both DOT and ECE certifications that ensure safety and performance. The product is enhanced with Alpinestars' Rotational Acceleration Force Protection technology, offering crucial protection to riders by mitigating brain injuries from oblique impacts. The SM3 is constructed with four densities of EPS, integrated across five different EPS sizes, enabling a finer-tuned fit for a wide range of head shapes.

Construction:

• A race-inspired helmet with solid aerodynamics and design borrowed from SM5 and SM10 helmets
• Thermo-injected shell incorporating a special polymer blend
• Rotational Acceleration Force Protection
• Visor Release
  • Patented visor release system ensures the visor is released with the correct predetermined amount of force
  • Effectively reduces the forces on the rider’s neck during an impact
• 5 EPS inner liner sizes
• 4 densities of EPS effectively manage volume and impact performance
• Hydration tube channels are integrated into the helmet’s cheek pads for convenience and performance

Comfort:

• Fit can be tailored to the rider’s head replacement liner and cheek pads with different thicknesses (sold separately) 
• Maximized ventilation and high levels of heat transfer exchange
• 10 inlets and 7 exhaust ports
• 25mm soft textile chin strap

Safety:

• Rotational Acceleration Force Protection
  • Alpinestars patented low-friction coating is applied to the inner part of the main EPS liner to reduce the rotational acceleration forces
  • Acts as a slip plane to mimic the brain’s own low-friction cerebrospinal fluid
  • Reduces forces of oblique impacts
• Equipped with an Emergency Release Cheek Pad System
  • Permits the safe and easy removal of the cheek pads while the helmet is still on
• Stainless steel D-rings
• Emergency Release System and removable cheek pads
• DOT and ECE 22.06 certified