Samshield XJ HelmetMATERIALS FOR OPTIMAL SAFETY The outer shell of the XJ is made of pure carbon fiber, a composite material providing an unbeatable strength weight ratio. The inner shell is made of polystyrene with variable density providing a better dissipation of the energy produced upon impact. STABILITY The internal comfort foam (liner), shape memory kind, ensuring a constant thickness over the years of use and the semi rigid jugular cancel all risks of tipping the