Size Guide

Alpinestars S-M3 Radium Youth MX Helmet – Grey/Black/Yellow Youth MX Safety

Equip your young rider with top-notch protection and a striking look with the Alpinestars S-M3 Radium Youth MX Helmet in grey, black, and yellow. At Moto Central, a leading UK retailer for Alpinestars, we offer this anatomically engineered helmet tailored for youth and younger riders. Optimized for MX, Enduro, and off-road riding, the S-M3 Radium Youth Helmet incorporates technologies from Alpinestars’ adult helmets, ensuring optimal performance, protection, and comfort.

This lightweight helmet features a thermo-injected shell with a special polymer blend, designed to deliver the ideal balance of impact protection and low weight. The outer shell is constructed from advanced impact-resistant thermoplastic, available in three sizes (Youth Small, Youth Medium, and Youth Large). The fit can be customised with crown and cheek pads, available as genuine spare parts. Youth Medium and Large sizes share the same EPS size for growth adjustments, while Youth Small has a dedicated EPS size for younger riders. The multiple density inner liner provides enhanced impact absorption and reduces weight.

The helmet features Alpinestars patented low-friction coating on the inner EPS liner to reduce rotational acceleration forces. The patented visor release system minimises neck forces during impacts. A comfort liner made from recycled materials, hydration tube channels, and a soft 25mm chin strap enhance rider comfort. Alpinestars has introduced a new in-house standard for the SM3 Youth, testing chin protection beyond homologation standards. The helmet is equipped with an Emergency Release System, removable cheek pads, and stainless steel D-rings for a secure fit. Maximised ventilation is achieved through 10 inlets and seven exhaust ports, with a visor designed to direct airflow. As a big UK retailer for the Alpinestars brand, Moto Central can order any colour or size you desire. Experience the advanced protection and vibrant style of the Alpinestars S-M3 Radium Youth MX Helmet. We are happy to order any product that our customers want to see.