The Alpinestars SM3 Radium Red/White Helmet delivers advanced protection, lightweight performance and premium comfort for motocross, enduro and off-road riders. Featuring a lightweight thermo-injected polymer shell, multi-density EPS/EPP liner and patented low-friction technology, the SM3 is engineered to manage impact energy and help reduce rotational forces from angled impacts. With optimized ventilation, customizable fit, emergency release cheek pads and ECE 22.06 certification, this high-performance MX helmet provides exceptional safety, airflow and comfort for riders demanding race-ready performance.

  • Engineered for motocross, enduro and off-road riding with advanced protection, comfort and performance technologies
  • Lightweight thermo-injected polymer shell with optimized thickness zones for superior impact protection and reduced weight
  • Medium ECE size weighs approximately 1310g for lightweight performance
  • Multi-density EPS/EPP liner with 6 sections and 5 densities for enhanced impact energy management
  • Patented low-friction EPS coating helps reduce rotational forces from angled impacts
  • Optimized inner and outer shell surfaces minimize the effects of oblique impacts
  • Enhanced chin bar construction tested beyond standard requirements for superior impact performance
  • High-performance ventilation system with 10 intake vents and 7 exhaust ports for maximum airflow and heat transfer
  • Patented visor release system helps reduce forces transferred to the rider’s neck during impacts
  • Emergency Release System with removable cheek pads for safer and easier helmet removal
  • Adjustable crown and cheek pads available in multiple thicknesses for a customized fit
  • 3D contoured foam padding provides enhanced comfort and secure fit
  • Integrated hydration tube channels in cheek pads for convenient hydration system compatibility
  • Recycled material comfort liner for improved sustainability
  • Soft 25mm textile chin strap for rider comfort and safety
  • Stainless steel double-D ring closure system for a secure fit
  • ECE 22.06 certified for advanced helmet safety performance