Alpinestars SM3 Radium Helmet Gloss Black/White/Gray (S2XL)

The new Alpinestars SM3 Radium helmet delivers performance, comfort, and protection in a lightweight, value-packed package. Built for MX, enduro, and off-road riders, this helmet is ECE 22.06 and DOT certified and features advanced rotational impact management and ventilation in a sleek gloss black/white/gray finish.

Whats Included

• 1x Alpinestars SM3 Helmet (Radium graphic)

• Removable crown and cheek pads

• Adjustable breakaway visor

• Hydration channel-ready cheek pads

• Helmet bag

• Sizes: S, M, L, XL, 2XL

Fitment

• Riding style: MX, Enduro, Off-Road, UTV, ATV

• Gender: Unisex

• Size group: Adult

• Available sizes: Small through 2XL

• Model: SM3 Radium

Warranty Info

Covered under Alpinestars’ limited manufacturer warranty. Visit Alpinestars.com for coverage details.

Key Features

• DOT & ECE 22.06 certified for safety compliance

• Thermoplastic shell with varied thickness for optimized weight and protection

• Composite fiber-reinforced inner shell for enhanced impact resistance

• 6-piece EPS liner with 3 densities for targeted impact absorption

• Maximized airflow: 10 intake and 7 exhaust ports

• Breakaway visor system reduces neck strain during crashes

• Low-friction EPS liner for improved rotational impact protection

• Emergency Release System (ERS) and 3D cheek pads for safer removal

• Chin strap: 25mm soft textile with stainless steel D-rings