The HIRP (High Impact Resistant Polymer) Material is formulated by a polymer injected into very precise blocks to provide better properties such as lightness and impact resistance. 1 external shell sizes “ECE” approved protection DOT approved protection All MT HELMETS helmet pads are easily removable for cleaning with warm water and neutral soap. The pads are antiallergic and antibacterial. We have a diversity of fabrics for the interiors of the helmets. The materials used for the interiors of MT HELMETS helmets are made with flame retardant fibers to ensure optimum safety. Metal micrometric closure system Internal shell of high impact absorption. Multiple density internal polystyrene Internal sunscreen system Easy screen disassembly system