Polyethylene yarns

And a polymer having a degree of crystallinity and gel spun polyethylene multifilament yarn, as well as stretching method used in their manufacture. This stretch yarn can be used in body armor, helmets shock, chest protector plates, helicopter seats, shatter-proof layer and other applications in the absorption and ballistic resistance; composite materials for sports equipment such as kayaks, canoes, bicycles and ship; and means for fishing line, sails, ropes, sutures and fabrics.