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What are the different types of life preservers?

Q: What are the different types of life preservers?
A: Some life preservers (also called life jackets, PFDs, life vests, etc.) have a foam core. These life preservers are inherently buoyant, even if water leaks in. They tend to be used in relatively safe environments (like swimming pools and amusement parks. Coastal cruises and airlines use air chamber life preservers. These tend to have more buoyancy than foam life jackets, but they must be inflated. There are also specialized lifejackets used for kayaking, fishing, rafting, and other water sports

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