Life jacket

　　A life jacket, also known as a life vest, is a type of life-saving clothing. It is usually made of materials such as nylon or NEOPRENE, with buoyancy materials filled inside or an inflatable design. The main function of a life jacket is to provide sufficient buoyancy to keep the head of a person who has fallen into the water above the surface, thereby increasing the chance of survival. Generally speaking, the service life of a life jacket is 5 to 7 years and it is an essential safety device on ships, aircraft and other means of transportation.