1. Buoyancy material filled lifejacket, which is made of nylon cloth or neoprene rubber and filled with buoyancy material in the middle.
2. Inflatable life jacket: made of high-strength waterproof material, similar to inflatable life buoy or swimming circle. Inflatable or passive inflatable. But the most important thing to notice about this life jacket is that it is absolutely necessary to avoid piercing or grinding the waterproof layer, which can cause disastrous consequences.