What does 'thermal protection' refer to in diving?

Thermal protection in diving specifically refers to the use of wetsuits or drysuits, which are designed to insulate the body against the effects of cold water. These suits trap a layer of water between the suit and the skin, which is then warmed by the body's heat, helping to maintain an acceptable body temperature during dives in colder environments. This thermal regulation is crucial for comfort and safety, as hypothermia can be a real risk when divers are exposed to cold water for extended periods.

While weight belts, sunscreen, and underwater breathing apparatuses are all important components of a diver's gear, they do not directly contribute to thermal protection. Weight belts help achieve proper buoyancy, sunscreen protects skin from sunburn during surface intervals, and breathing apparatuses are essential for underwater respiration, but none of these provide the insulation necessary to protect against cold temperatures underwater.