What type of suits are specifically designed to retain body heat while diving?

The best choice for suits specifically designed to retain body heat while diving is exposure suits, as they encompass a variety of suit types, including wet suits and dry suits.

Exposure suits are designed to provide thermal protection against cold water, helping to regulate body temperature during dives. Wetsuits trap a thin layer of water between the suit and the diver’s skin. This water is warmed by the body heat, creating insulation. On the other hand, dry suits are designed to keep the diver completely dry by sealing out water. They allow for air between the suit and the diver, enhancing warmth even in colder conditions.

While dry suits and wetsuits are effective, the term "exposure suits" broadly includes these variations, referring to any suit meant to protect against the elements and retain body heat during immersions. This makes exposure suits an accurate descriptor for suits that help with thermal management in diving environments. The other options, like rescue suits, serve specific purposes but are not primarily designed for heat retention.