Each crew member of a boat needs some form of personal buoyancy.
Therefore your boat must carry approved life jackets or buoyancy aids.
Life jackets are designed to keep an unconscious person on his back in the water, so that mouth and nose are clear of the water.
Personal flotation devices are designed to keep the wearer afloat.
How do you select the right flotation device? Life jackets and buoyancy aids should always be approved according to the European standards (BSEN).
An international standard has not yet been implemented.