Air chamber
Life jackets for large commercial transport in potentially dangerous waters, such as coastal cruises and airlines, are often a sealed suit of heavy vinyl with an inflatable air chamber, and usually provides more buoyancy than its foam counterpart. The air chambers, usually located over the breast and back regions of the body, may be inflated by either self-contained carbon dioxide cartridges activated by the pulling of a cord, or blow tubes with a one-way valve for inflation by exhalation. Some of the inflatable life jackets also have a reaction with the water salt/fresh therefore enflating them.
Drifting in open seas and international waters, as encountered by long sea voyages and military forces, require prolonged survival in water. The life jackets suited for this purpose are often also equipped with survival kits, usually containing signalling devices, first-aid kits, food, water, and shark repellent.
(courtesy of wikipedia.com)
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