1. Buoyancy ≥74N only to be used by seaman during working.
2. Buoyancy ≥83.3N used for the seaman and passenger in sea or river travel.
1. Providing the most buoyancy and floats the best
2. It is reversible
3. Easy to put on and design to turn in water from face-down position to an upright and slightly backward positon
4. Effect in all types of water, especially where rescue is delayed.
