Motocross Helmet Alpinestars S-M3 Radium
The Alpinestars S-M3 Radium is an advanced motocross helmet engineered specifically for MX, enduro, and rugged off-road performance. This motorcycle dirt bike helmet combines a thermo-injected polymer shell with a sophisticated five-piece, multi-density EPS liner, ensuring optimal shock absorption against both direct and oblique impacts. A patented low-friction internal layer reduces rotational acceleration forces transmitted to the brain, while the smart visor release system unclips under impact to mitigate neck strain. Complete with ten air intake ports and seven exhaust vents, it maintains exceptional airflow in demanding conditions. Wear for optimal riding comfort with your preferred MX goggles and a compatible neck brace.
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- Material & Shell Construction: Thermo-injected advanced polymer blend with varying wall thicknesses for superior rigidity, impact distribution, and light weight (approx. 1430 g ECE).
- Safety & Certification: Fully certified to rigorous ECE 22.06 and DOT standards. Features a patented low-friction rotational slip plane and a chin bar built to exceed standard homologation benchmarks.
- Visor Release Mechanism: Patented visor detachment system that safely releases the peak under a calculated force threshold during a crash to reduce twisting neck forces.
- Emergency Release & Retention: Emergency Release System (ERS) with 3D-moulded cheek pads for safe helmet removal by rescue personnel, secured by stainless steel double-D rings and a 25 mm webbing strap.
- Ventilation: Comprehensive ventilation network featuring 10 air inlet vents and 7 exhaust ports for unmatched thermal regulation and cooling.
- Comfort & Ergonomics: Moisture-wicking, removable, and washable comfort liner crafted from recycled materials, with pre-routed hydration tube channels integrated into the cheek pads.
- Season: Engineered for year-round off-road, track, and trail riding in all weather conditions.
- Sizes & Gender: Available in sizes S through XL for unisex riders.