What is the main purpose of a wetsuit?

The main purpose of a wetsuit is to provide thermal insulation. Wetsuits are designed to retain a thin layer of water between the suit and the diver's skin. This layer of water is warmed by the body heat of the diver, creating an insulating barrier that helps to maintain body temperature in cooler water conditions. The material of the wetsuit, typically made from neoprene, traps air bubbles that also contribute to insulation, making it effective for thermal protection during water activities.

While enhancing visibility and increasing buoyancy are benefits that some wetsuit designs might offer (particularly bright colors for visibility or buoyant materials), these are secondary to the primary function of thermal insulation. Additionally, a wetsuit does not prevent drowning; rather, it aids in thermal protection and comfort while diving.