Life jacket

Also: self-righting vest, rescue vest

A life jacket turns an unconscious person onto their back. For paddlers there are special whitewater rescue vests with a rescue harness.

In boating, a distinction is often made between buoyancy aids (for people who can swim, lots of freedom of movement) and life jackets (more buoyancy, self-righting, but bulkier). Whitewater rescue vests like the Astral Green mentioned by Luc Mehl also have a quick-release harness for rope rescue.