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The 2nd life vest is combination of buoyant and inflatable life vest which is suitable for volatile situation when someone is disconcerted by accident and cannot get out of vessel. The principle is like this: When you are locked in a ship, you can get away there by unbuckling buoyant vest belt and then operate inflatable vest to come up to the surface. We combined buoyant vest with inflatable vest by connecting them with a belt and make it detachable at once by partially attaching velcro at side and back.
Gyeongi-do, South Korea