1. Buoyancy material filling type life jacket, namely uses the nylon or the neoprene rubber to make the lining, the middle fills the buoyancy material.
2. Inflatable life jackets: The use of high strength waterproof materials manufactured, similar to inflatable buoy or swimming ring principle. Automatic inflatable or passive inflatable type. But this kind of life jacket should pay attention to is: absolutely avoid piercing or grinding the waterproof layer, air leakage will cause disastrous consequences.