what's the difference between level 3 and level 4 body armor

what's the difference between level 3 and level 4 body armor. There are some references to what's the difference between level 3 and level 4 body armor in this article. If you are looking for what's the difference between level 3 and level 4 body armor you've came to the right place. We have images about what's the difference between level 3 and level 4 body armor. You can check it out below.