A body armor insert has a set of ballistic cloth plies made from polyethylene fibers sandwiched between first and second sets of ballistic cloth plies made from aramid fiber. The number of plies in each of the three sets of plies is a function of a level of protection to be provided. Each of the two...http://www.google.com/patents/US4989266?utm_source=gb-gplus-sharePatent US4989266 - Body armor insert
