ALPINESTARS(MX) SM3 Radium Helmet — Size L, Black
Purpose-built off-road helmet with advanced impact mitigation, low-friction liner, patented visor release and high ventilation.
Purpose-built off-road helmet with advanced impact mitigation, low-friction liner, patented visor release and high ventilation.
The S‑M3 helmet is engineered for MX, enduro and off‑road use, featuring technologies optimized for comfort, ease of use and impact performance. 🏁
Its thermo-injected shell uses a special polymer blend with variable thickness to balance lightweight construction and impact protection.
A patented low-friction coating is applied to the inner EPS liner to reduce rotational acceleration from certain oblique impacts, mimicking the brain’s natural cerebrospinal fluid slip plane. ⚙️
Patented visor release reduces neck forces by releasing the visor at a predetermined force during an impact.
Maximized ventilation with ten inlets and seven exhaust ports promotes high levels of heat transfer and airflow for extended comfort.