Fly bow frames are fixed to the roof of the caravan so as to support a fabric cover, which creates a shaded area over the roof of the caravan and annex. The fly bows are adjustable in width to suit the caravan. The height is adjustable on one side or both sides. They can also have eave's which may be straight or have a return bend on them. The standard frame is made to suit a 240cm wide caravan with about 10cm of adjustment in and out. Wider frames can be manufactured on request.