A wetsuit is a piece of clothing designed to keep the wearer warm in cold water. It is usually made from two materials: Lycra and Neoprene. Lycra is a synthetic fiber that is lightweight, stretchy, and resistant to chlorine and salt water. Neoprene is a synthetic rubber material that is also resistant to chlorine and salt water, and provides insulation and buoyancy. Both materials are commonly used in wetsuits to provide warmth and comfort while swimming or diving.