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If you are scuba diving in colder water you may want to invest in a dry suit. They are considerably more expensive than wet suits, but the level of warmth and protection is unmatched by any other form of thermal protection. A dry suit can be made out of foam neoprene, crushed neoprene, vulcanized rubber or heavy-duty nylon. They use a combination of wrist seals, a neck seal and a waterproof zipper to keep you dry.

Most dry suits incorporate fully attached scuba booties as well. For added warmth you can wear dry-suit underwear beneath the dry suit. The underwear traps a layer of air between your skin and the water, which warms to your body temperature and helps to keep you warm. Like any thermal protection, the amount of underwear you need is based on the water temperature, your activity level during a dive and your body size. It is important for you to try different amounts of insulation to determine what you need.