Dry suits offer superior protection from cold water by keeping the diver dry through sealed seams and waterproof zippers. They are typically used in colder environments where wetsuits would be insufficient. Dry suits have built-in insulation layers and allow divers to wear thermal undergarments to enhance warmth. They also come with wrist and neck seals to prevent water entry. Proper training in dry suit use is necessary, as divers need to manage air in the suit to maintain buoyancy and prevent squeeze during the dive.