The Alpinestars Youth SM3 Radium Helmet is designed for young riders who need dependable impact protection, a secure fit, and effective ventilation during off-road riding. This medium helmet features a lightweight, impact-resistant thermoplastic shell made with a specialized polymer blend and varying shell thicknesses to balance protection and weight. The Alpinestars SM3 also uses a multiple-density EPS inner liner, positioning the appropriate density in key areas to improve impact absorption and help reduce overall helmet weight.
Engineered for modern impact performance, the helmet’s inner and outer surfaces help minimize the effects of oblique impacts. A low-friction coating on the primary EPS liner creates a slip-plane effect intended to reduce rotational acceleration forces associated with certain angled impacts. The visor release system is designed to release at a predetermined force, helping reduce the load transferred to the rider’s neck during an impact. Ten intake vents and seven exhaust ports support high levels of airflow and heat exchange, while the visor helps direct air into the ventilation system for improved circulation.
Fit and comfort can be customized with replaceable crown and cheek pads available in different thicknesses. The recycled-material comfort liner helps reduce environmental impact, while integrated hydration tube channels in the cheek pads provide convenient routing for hydration systems. A 25-millimeter soft textile chin strap, stainless steel D-rings, and a secure retention system help maintain a stable fit. The Emergency Release System and removable cheek pads allow safer, easier removal while the helmet remains on the rider. The Alpinestars Youth SM3 Radium is finished in Gloss Yellow Fluo, Black, and Blue and is identified by manufacturer and vendor part number 8301825-5017-YM.
Features:
- Youth Medium Fit: Designed for young riders requiring a secure and comfortable medium helmet fit
- Radium Colorway: Gloss Yellow Fluo, black, and blue finish for a distinctive off-road appearance
- Thermoplastic Shell: Lightweight impact-resistant outer shell uses a specialized polymer blend with varied thicknesses
- Multiple-Density EPS Liner: Uses targeted liner densities to support impact absorption and reduce overall weight
- Oblique Impact Design: Inner and outer surfaces are engineered to help minimize the effects of angled impacts
- Low-Friction EPS Coating: Slip-plane layer is designed to reduce rotational acceleration forces from certain oblique impacts
- Ventilation System: Ten intake vents and seven exhaust ports promote airflow and heat exchange
- Visor Release System: Predetermined-release design helps reduce forces transferred to the rider’s neck during an impact
- Adjustable Interior Fit: Replaceable crown and cheek pads are available in different thicknesses for personalized fit
- Hydration Tube Channels: Integrated routing channels in the cheek pads support convenient hydration system use
- Emergency Release System: Removable cheek pads allow easier and safer helmet removal while the helmet is worn
- Secure Retention: Soft 25-millimeter textile chin strap and stainless steel D-rings provide a dependable fit
- Manufacturer: Alpinestars
- Vendor Part Number: 8301825-5017-YM