These kites do not have a frame but they become semi-rigid when their multiple cells fill with air. To maintain their form, parafoils frequently have many bridle lines. Some large soft kites develop enough pull to lift heavy objects, including motor vehicles. Domina Jalbert had a history of designing kites and was involved in the development of hybrid balloon-kite aerial platforms for carrying scientific instruments. He envisaged the parafoil would be used to suspend an aerial platform or for the recovery of space equipment.