A buoyancy aid is a garment that helps keep a person afloat. Wear a buoyancy aid.
It is not a life jacket, since it will not turn an unconscious person face up. A buoyancy aid suits somebody who can swim and expects to be in the water.
1nounbuoyancy aidA garment that helps keep a person afloat.
“Every paddler wore a buoyancy aid whether they wanted to or not.”
buoyancy aid is equipment.
Practised in Swimming & Diving