Alpinestars SM3 Radium Helmet

The Alpinestars SM3 Radium is a value-packed off-road helmet built for motocross, enduro and trail riding. It carries both DOT certification and ECE 22.06 homologation, so it's approved for use worldwide, and it pairs Alpinestars' protection technology with a lightweight polymer shell.

Key Features

• Thermo-injected polymer shell: a special polymer blend with varying thickness for a balance of impact protection and low weight.
• Rotational impact protection: a patented low-friction coating on the EPS liner and a specially developed comfort liner reduce the rotational forces from angled impacts.
• Multi-density EPS/EPP liner: six inner parts in five densities, with a liner sized for each helmet size.
• Patented visor release: the visor releases at a set force to reduce the load on your neck in a crash.
• Maximum airflow: 10 intake vents and 7 exhaust ports.
• Tougher chin protection: the chin area is tested to an Alpinestars in-house standard that is more demanding than the homologation standard.

Comfort & Fit

• Emergency-release removable cheek pads, with 3D contoured foam.
• Hydration tube loops built into the cheek pads.
• Comfort liner made with recycled materials.
• Crown and cheek pads are available as genuine spare parts in different thicknesses to tailor the fit.
• Soft 25 mm textile chin strap with stainless steel D-rings.

Specs

• Brand: Alpinestars
• Style: Off-road / MX / enduro helmet with peak visor
• Certification: DOT and ECE 22.06
• Weight (size M): 1,310 g (ECE) / 1,430 g (DOT)
• Ventilation: 10 inlets, 7 exhausts

Always check the fit before you ride. Size up or down using the sizing chart, and replace any helmet after a crash.