Most people are not unfamiliar to the bulletproof vests ,but some people still think there is a steel plate armor, although the original armor indeed, but with the progress of science and technology vests inside the material has long been upgrading. Recently, a net friend showed us the material of the bullet proof vest. The conventional bulletproof vests one on the market to buy back the placed on the ground, and began to use cutting machine for cutting. The conventional armor toughness is very large, full back and forth cut 1 minute to be cut off. Then, when he opened the inner body armor, we can be surprised to find that there was no what plate, but also the thickness of dozens of layers of Kevlar. This fiber effect is very strong, even the first bullet layer does not penetrate, and just leave a Notch.