ALPINESTARS SM3 RADIUM HELMET ECE06/DOT BLACK

Alpinestars SM3 Radium Helmet Ece06/dot Black/white/gray Glossy pairs a clean tonal finish with a helmet engineered for MX, enduro, and off-road riding, integrating advanced comfort and impact-protection technologies.

Five EPS inner parts across four densities effectively manage volume and impact performance, while the thermo-injected shell’s special polymer blend and varying thickness deliver the optimal balance of protection and light weight — a size medium weighs 1430g in ECE spec and 1460g in DOT spec. Ten intake vents and seven exhaust ports maximize ventilation and heat transfer during hot laps.

Alpinestars’ patented low-friction coating on the inner main EPS liner acts as a slip plane that mimics the brain’s own cerebrospinal fluid, reducing rotational acceleration forces from oblique impacts. A new in-house chin standard exceeds the base homologation requirement, with optimized shell thickness and structure in the chin area, and the patented visor release system detaches with a precise, pre-determined force to reduce forces on the rider’s neck.

Hydration tube channels are integrated into the cheek pads, and the comfort liner is built from recycled materials for a lower carbon footprint. An Emergency Release System with removable cheek pads allows safe removal while the helmet is still on, and stainless steel D-rings with a soft 25mm textile chin strap keep the fit secure. Conforms to both DOT certification and ECE 22.06 homologation.

Product Specifications

Shell: thermo-injected special polymer blend with variable thickness
Ventilation: 10 intake vents and 7 exhaust ports
Rotational protection: patented low-friction coating on inner EPS liner
Visor: patented visor release system with pre-determined release force
Liner: 5-piece EPS inner liner with 4 densities, recycled-material comfort liner
Safety: Emergency Release System with removable cheek pads, stainless steel D-rings
Weight: 1430g (ECE) / 1460g (DOT), size medium
Certification: ECE 22.06 homologation and DOT certified
Color: Black/White/Gray Glossy

Additional information

SIZE	XS , S , M , L , XL , 2XL

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Shipping & Delivery

Order Processing

Standard orders are processed and dispatched within 1–3 business days of payment confirmation. A dispatch confirmation with your tracking details will be sent to your registered email address as soon as your order ships. Orders submitted on weekends or public holidays enter processing on the next available business day.

Estimated Delivery Timeframes

Region	Standard	Express
United States	7–12 business days	4–6 business days
United Kingdom	5–8 business days	3–5 business days
Canada & Australia	8–14 business days	5–7 business days
Rest of World	10–16 business days	6–9 business days

Timeframes are estimates and are subject to carrier schedules, customs processing, and seasonal demand. Express shipping availability is confirmed at checkout.

Duties & Taxes Paid — What You See Is What You Pay

Every order ships on a Delivered Duty Paid (DDP) basis. All import duties, taxes, and customs clearance fees are settled before your order leaves our facility. There are no surprise charges on delivery — ever.

Shipment Tracking

A tracking number and carrier link will be included in your dispatch confirmation email. You can monitor your delivery status in real time from the moment your order leaves our facility.

Delivery Enquiries

If your order has not arrived within the estimated window, or if you have received a damaged or incorrect item, please contact our customer support team directly. We will investigate promptly and arrange a resolution — whether that is a replacement, reroute, or full refund.