The safety vest protects the back and chest when accidents happen. The shock-absorbing material distributes the impact across the body to minimize injury. A safety vest should fit snugly against the body with only a thin sweater underneath. Therefore, the jacket should be worn on top. Choose a comfortable vest that does not restrict your movements while covering the chest and collarbone. The front should extend two to three centimeters below the lowest rib, and the back should cover up to the lower part of the neck and end a few centimeters from the tailbone.