require trekking poles?
No trekking poles are needed for either model. For free-standing setup, the Rainbow needs at least 51″ (130 cm) poles and the Double Rainbow needs at least 55″ (140cm) poles. An additional 5 cm helps a lot. Pole tip extenders can be made from PVC pipe or, alternately, aluminum trekking pole tip extenders are available in the webstore. A 6″ PVC pipe extension adds 4″ to the trekking pole length (since you you lose 2″ in the overlap).