The International Speed Windsurfing Class (ISWC) is a class of speed windsurfing boards that has developed over the last 30 years in order to facilitate high performance competition in strong winds and on flat water. The International Speed Windsurfing Class is controlled by World Sailing and has been adopted as an international class in spring 2007. The class is defined as an "experimental" class, which means that the class rules give a wide possibility for the development of new equipment, also outside commonly used technologies. Speed windsurfing events are normally held on "flat water" as opposed to coastal surf; which means side-offshore wind directions with a strength of at least 20 knots (10 m/s). The ISWC speed world champion is established throughout a tour, the Speed World Cup.