Windsurfing or sailboarding is a surface water sport that combines elements of surfing and sailing. It consists of a board usually two to four metres long, powered by wind on a sail. The rig is connected to the board by a free-rotating universal joint and comprises a mast, wishbone boom and sail. The sail area ranges from less than 2.5 m² to more than 12 m² depending on the conditions, the skill of the sailor and the type of windsurfing being undertaken.