SOLAS survival suits
Immersion and survival suits are full suits that help prevent the onset of hypothermia for those forced to leave the vessel in the event of major damage and remain in the water for long periods. The survival suit comes in a bag and the sailor must wear the immersion suit as soon as the order to abandon ship has been given.
The immersion suit or survival suit is equipped with retro-reflective strips, a whistle, a pouch of liquid dye for signalling your position and a safety line made from synthetic rope.
This equipment must be SOLAS certified.