1. Buoyancy material filled life jacket, that is, nylon cloth or neoprene as fabric, and buoyancy material in the middle.
2. Inflatable life jacket: made of high-strength materials, similar to the principle of inflatable lifebuoy or swimming ring. It is divided into automatic inflatable type or passive inflatable type. However, this kind of life jacket should pay attention to: avoid sharp objects to pierce or wear the layer, after the air leakage will cause unimaginable serious consequences.
