Akademik

rescue equipment consisting of a buoyant belt or jacket to keep a person from drowning

↑life buoy, ↑lifesaver, ↑life belt, ↑life ring, ↑life jacket, ↑life vest, ↑cork jacket, ↑water wings

noun, pl ⋯ -ers [count]

chiefly US : a floating device that is designed to save you from drowning

ˈlife preserver [life preserver] noun (NAmE)

a piece of material that floats well, or a jacket made of such material, used to rescue a person who has fallen into water, by keeping them above water