Alpinestars SM3 Radium Helmet

Varied thickness shell construction for optimized protection and light weight Optimized for MX, Enduro, and Offroad use Delivers blend of performance, protection, and comfort Key Features Features thermo-injected shell incorporating a polymer blend enhanced by varying degrees of thickness that is engineered to deliver the optimal combination of impact protection and light weight Lightweight outer shell is constructed from impact resistant thermoplastic Inner shell constructed with a composite fiber assembled between the outer shell and the EPS liner for maximum protection against impacts Fit can be tailored to the rider's head thanks to the helmet's crown and cheek pads Construction Multiple density inner liner ensures the helmet is equipped with the correct density in the correct area for enhanced impact absorption, while also helping to reduce overall weight 6-piece EPS liner with three different densities Polished inner EPS liner with special coating to reduce friction with com