Inner kidney insulation system

Multiple Shield Options

foam padded elbow & shoulder area

Advanced Noise Control that ensures ambient noise doesn't interfere with incoming and outgoing audio

Covered hard knuckle with padded finger for better protection

Alpinestars S-M3 Radium Helmet Helmets Inner kidney insulation systemEngineered for MX, Enduro, and off road riding, the SM3 Helmet integrates advanced technologies and innovations designed to enhance ease of use, comfort, and impact protection. Advanced Shell Construction: This helmet features a thermo injected shell incorporating a special polymer blend enhanced by varying degrees of thickness that is engineered to deliver the optimal combination of impact protection and lightweight. The SM3 medium weighs 1430g (ECE)