Life jacket, also known as life vest, is a kind of life-saving clothing. It is designed similar to a vest. It is made of nylon fabric or neoprene, buoyant material or inflatable material, and reflective material. The general service life is 5-7 years, and it is one of the life-saving equipment on board and aircraft. Generally vest type, made of foam plastic or cork. It has enough buoyancy to wear on the body, so that the head of the person falling into the water can be exposed.