Life jacket, also known as life vest, is a kind of life-saving clothing. Its design is similar to vest. It is made of nylon fabric or neoprene, buoyant material or inflatable material, reflective material, etc. The general service life is 5-7 years. It is one of the life-saving equipment on ships and aircraft. Generally, it is made of foam plastic or cork. It has enough buoyancy on the body so that the head of the diver can come out of the water（life jacket)
