Life jacket, also known as life vest, is a life-saving clothing. It is designed like a vest and made of nylon fabric or neoprene, buoyancy material or inflatable material, reflective material, etc. The general service life is 5-7 years, which is one of the life-saving equipment on ships and aircraft. It is generally vest type, made of foam plastic or cork. Wearing on the body has enough buoyancy to make the head of the person falling into the water surface.

Inflatable life jackets can be inflated manually and automatically, and are applicable to the water escape tools in the fields of passenger and cargo ships, yachts, military, water police, water anti-smuggling boats, water construction operations, offshore drilling platforms, flood fighting and disaster relief, salvage and flood prevention, navigation, hydrology, water conservancy, etc.