Regular Alcantara w. Leather Chrome, Dress Cut - NavyMATERIALS FOR OPTIMAL SAFETY The outer shell of the Premium is made of polycarbonate, which is a material used, among other things, for high end motorcycle helmets. It is equipped with original Alcantara. 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, ? shape memory? kind, ensuring a constant thickness over the years of use and the