Alpinestars Youth SM3 Radium Helmet — Youth M, Matte Black, Gray, Yellow

Anatomically engineered for youth riders, optimized for motocross, enduro and off‑road use.

The thermo-injected outer shell uses a variable-thickness polymer blend to balance impact protection with low weight.

The multiple-density inner liner places the correct foam density where it’s needed to enhance impact absorption while helping reduce overall mass.

A patented low-friction coating on the main EPS liner acts as a slip plane to reduce rotational acceleration from oblique impacts.

The patented visor release system is calibrated to release under a predetermined force, helping reduce loads on the neck during an impact.

The comfort liner is constructed from recycled textiles for a lower carbon footprint, and cheek pad channels accept hydration tubes for convenience.

An emergency release system and removable cheek pads allow safe helmet removal while preserving comfort with 3D-contoured foam.

Maximized ventilation features multiple inlets and exhaust ports; the visor is shaped to channel air into the vents for enhanced airflow. 🚵