What is the primary function of a life jacket?

The primary function of a life jacket is to help keep a person afloat in case of an emergency. Life jackets are designed with buoyant materials that provide sufficient flotation to support a person's weight in water, allowing them to remain on the surface and breathe while awaiting rescue or assistance. This crucial feature significantly increases the chances of survival for someone who has fallen overboard or is otherwise in distress in the water.

While life jackets may provide some warmth due to their insulating properties and can be comfortable to wear, their main purpose is to ensure buoyancy and safety in aquatic environments. They are not intended to serve as seat cushions or enhance swimming abilities, as their design prioritizes flotation rather than mobility or comfort when swimming.