a bullet-proof vest (also called "bulletproof vest", "body armor" or "body armour") is a protective piece of clothing that covers the torso (chest, abdomen, and back) of a person. it protects the wearer from most pistol and revolver bullets and from fragments of explosive devices such as grenades. bullet-proof vests are worn by police officers, soldiers, security guards, and people who are at risk of being shot (such as the leader of a country).