2011-11-16
The conventional motorcycle helmet has two principal protective components: a thin, hard, outer shell typically made from polycarbonate plastic, fiberglass, or Kevlar and a soft, thick, inner liner usually made of expanded polystyrene or polypropylene "EPS" foam. The purpose of the hard outer shell is:
A. To prevent penetration of the helmet by a pointed object that might otherwise puncture the sku