The foam layer is injected directly into the hard outer shell . PC, polycarbonate is the material used for the manufacture of the helmet shell. The polycarbonate shell is firmly bonded to the EPS inner material. The EPS material is injected directly into the polycarbonate face sheet to form an integral unit. The monolithic unit absorbs punctual impacts on a sharp object and the force acting on the helmet is distributed over its entire surface, so that the head is perfectly protected. FAS is a quick adjustment system that forms a network of straps anchored inside the helmet. Allows a firmer and more secure hold of the helmet on the head. The ingenious IAS-3D system allows a good adjustment of the helmet size to different head sizes and shapes by simply turning the adjustment dial. The interior of the helmet adjusts to the height and circumference of the head.