Background and history
t was a good idea not to fall in the sea! But if you did a lifejacket helped to keep you afloat.
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History of lifejackets
Early life jackets were made of cork and were bulky and uncomfortable to wear
Kapok ( a natural material) was also tried
Inflatable lifejackets (called Mae Wests) were used by airmen during WW2
Modern Lifejackets automatically inflate and are comfortable to wear