Wetsuits are designed to provide thermal insulation and protection from the elements while diving. They are made from neoprene, which traps a thin layer of water between the suit and the diver's body. This water is warmed by body heat, helping to keep the diver warm. Wetsuits come in various thicknesses and styles, including full suits, semi-dry suits, and shorties, to suit different water temperatures and diving conditions. Proper fit is essential to ensure the wetsuit performs effectively, and regular care is needed to maintain its flexibility and integrity.