1. Buoyancy material-filled life jacket, that is, nylon cloth or neoprene as the fabric, and buoyancy material in the middle.

2. Inflatable life jacket: It is made of high-strength materials, similar to the principle of an inflatable life buoy or swimming ring. It can be automatically inflated or passively inflated. But this kind of life jacket should pay attention to: avoid sharp objects pierce or wear the layer, the air leak will cause unimaginable serious consequences.