At SX a power kite or traction kite is a large kite designed to provide significant pull to the user. They come in three main forms: foils, leading edge inflatables and supported leading edge. There are also rigid-framed kites and soft single skin kites. There are several different control systems used with these kites which have two to five lines and a bar or handles. Most foil kites are made for use on land as they are 'opened celled' so air flows in and out easily, this can be used as a safety feature to depower the kite. There are a few exceptions for this with new foils that use closed cell technology you make them float on the water while you relaunch, this will improve the range of sports under taken by one breed of kite.