a wetsuit is a garment used by scuba divers, snorkelers, windsurfers, and surfers to keep themselves warm when they are in cold ocean water. wetsuits act as insulation invented by jack o'neill, and help the body to retain its heat. wetsuits are made of plastic or rubber materials such as neoprene. wetsuits include torso coverings, leggings, head coverings, and hand and feet coverings.