Modern helmets are designed so that they convert to a force, such as a blow this into deformation energy. The key is less the material of the outer shell, but rather the nature of the inner material, ie the (usually invisible) polystyrene foam that sits between the outer shell and lining: This layer is the only compressible part of the helmet, and it can accept in the event of an accident, the actual loss. While the shell is distributed in any impact, the forces on the largest possible area, which deforms elastically, it then returns back to its original shape. Other hand, suffers the polystyrene layer, a plastic and causing permanent deformation.

This deformation causes the helmet is invalid in its entirety, because then he is no longer able to take on the original protective function. It is therefore recommended to use a helmet after an accident or no longer be returned to the manufacturer for testing, even if only minor or no damage visually identify. For your riding comfort, get motorcycle jackets.

Without closed chin strap of the motorcycle helmets has no protective effect in that it is in an accident from head solves. Even a damaged helmet (dents, cracks or holes in the outer shell, after heavy pressure or tensile forces, even after falls from low heights) has possibly reduced protection. Folding helmets may be used only in the closed state, driving with raised chin part is generally not allowed. Exception of helmets, in which the chin guard can be pushed completely behind the helmet and have an additional examination as a jet helmet.