What is a "dry suit" primarily used for?

A dry suit is primarily used to keep the wearer dry in cold water. This specialized diving suit is designed to create a sealed environment around the diver, preventing water from entering while allowing for thermal insulation. The suit is typically made from waterproof materials and includes seals at the neck and wrists to prevent water ingress.

In cold water conditions, maintaining body heat is vital for the diver's safety and comfort. By keeping the water out and allowing the diver to wear insulating layers underneath, the dry suit effectively protects against hypothermia, which is a significant risk when diving in low-temperature environments. This capability makes the dry suit an essential piece of equipment for divers who need to operate in cold water locations, as it allows for longer dives without the risk of becoming overly cold or wet.

The other options do not accurately represent the primary purpose of a dry suit, as the suit does not provide buoyancy, enhance visibility underwater, or particularly increase flexibility. While it may have some secondary benefits related to buoyancy and mobility, the fundamental reason for using a dry suit is to ensure the diver remains dry and warm in cold aquatic environments.