Automatic Life Jackets

These life jackets work on the principle that an element in the inflation mechanism reacts with water (in most cases this ia a pill/pellet that dissolves in water), automatically triggering the gas cartridge, which in turn inflates the air chambers of the lifejacket.

Automatic Lifejackets are a popular choice due to the reassurances of an auto firing mechanism, ideal if you're knocked unconscious or suffer the effects of cold water shock when you hit the water.