ALPINESTARS SM3 RADIUM HELMET ECE06/DOT GRAY

Alpinestars SM3 Radium Helmet Ece06/dot Gray/black/yellow Fluo Matt brings a matte, high-visibility finish to a helmet engineered for MX, enduro, and off-road riding, built around advanced comfort and impact-protection technologies.

The thermo-injected shell uses a special polymer blend with varying degrees of thickness to deliver the optimal combination of impact protection and light weight, with a size medium weighing 1430g in ECE spec and 1460g in DOT spec. Maximized ventilation comes from 10 intake vents and seven exhaust ports, and five EPS inner parts across four densities manage volume and impact performance across the shell.

A new in-house chin standard, tougher than the base homologation requirement, has optimized the shell’s thickness and structure in the chin area for superior impact performance, while Alpinestars’ patented low-friction coating on the inner EPS liner reduces rotational acceleration forces from oblique impacts. The patented visor release system detaches with a precise, pre-determined force to reduce forces on the neck during a crash.

Hydration tube channels built into the cheek pads add convenience on long rides, and the comfort liner uses 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: Gray/Black/Yellow Fluo Matt

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.