Alpinestars Youth SM3 Radium Helmet — Size S, Black, Gray, Yellow, Matte
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Designed specifically for younger riders, this youth helmet is anatomically profiled for MX, enduro and off-road use. 🪖
A thermo-injected shell uses a special polymer blend with varying thickness to balance high impact protection and low weight.
A multiple-density inner liner provides targeted energy absorption while a patented low-friction layer helps reduce rotational acceleration from oblique impacts.
The visor features a controlled-release system to minimize neck loads in a crash, and an emergency cheek-pad release lets pads be removed safely while the helmet remains on.
Comfort features include tailored crown and cheek pads, a recycled-material comfort liner, integrated hydration tube channels and a soft 25mm chin strap with stainless steel D-rings.
Ventilation is maximized with 10 inlets and seven exhaust ports; the visor is shaped to drive airflow into the channels for efficient heat transfer. ⚙️
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