Kevlar is used to make this bulletproof vest.
Kevlar definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an aramid fiber used in making bulletproof vests, boat hulls, airplane parts, etc.
Origin: arbitrary coinage
Kevlar definition by American Heritage Dictionary
A trademark used for a type of aramid fiber.