ALPINESTARS(MX) Youth SM3 Radium Helmet — Size M, Gloss

Engineered specifically for youth and younger riders, the SM3 Youth helmet delivers MX, enduro and off‑road performance with a comfortable, growth‑friendly fit. 🪖

The thermo‑injected shell uses a special polymer blend with variable thickness to balance impact protection and low weight; the SM3 Youth is offered in youth sizes with a reported weight of approximately 1060 g.

A multi‑density EPS liner places the correct densities in the right areas for enhanced impact absorption, while an inner low‑friction coating helps reduce rotational acceleration from oblique impacts.

Crown and cheek pads are available as spare parts in different thicknesses so the fit can be tailored as the rider grows; YS has its own EPS size, while YM and YL share EPS to allow up‑sizing via pad replacement.

Safety features include a patented visor release system that reduces neck forces in an impact, an emergency cheek pad release for safe extraction, a soft 25 mm textile chin strap and stainless steel D‑rings for a secure closure. 🌿

Comfort and convenience are enhanced with a recycled‑material comfort liner, integrated hydration tube channels in the cheek pads, and maximized ventilation through 10 inlets and seven exhaust ports; the visor is shaped to direct airflow into the vents for improved cooling.