ALPINESTARS(MX) Youth SM3 Radium Helmet — Youth Small, Black

The Youth SM3 Radium Helmet is anatomically engineered for younger MX, enduro and off‑road riders, offering a tailored profile for youth heads. 🪖

A lightweight thermo‑injected shell uses a special polymer blend with variable thickness to balance impact protection and weight, with the youth model weighing approximately 1060 g.

A multi‑density inner liner and optimized internal geometry enhance impact absorption and reduce the effects of oblique impacts, while a low‑friction liner layer acts as a slip plane to mitigate rotational acceleration forces. ✨

Removable crown and cheek pads allow a custom fit as the rider grows; certain sizes share EPS volumes to simplify future resizing without replacing the shell.

A patented visor release system reduces neck loads during impact, and an emergency release system lets assistants remove cheek pads safely while the helmet remains on the rider.

Comfort features include recycled textile liners, integrated hydration tube channels in the cheek pads, a soft 25 mm chin strap, and stainless steel D‑rings for secure closure.

Ventilation is maximized with 10 inlets and seven exhaust ports, and the visor is profiled to direct airflow into the helmet for improved heat exchange.