Stretch support is used to be able to stretch backwards if you sit for a long time and are unable to stand up. Upholstery black leather. The support can be adjusted in height and set to how much it should tip backwards. It is not a backrest, as the back is held upright automatically by the back muscles when sitting in a riding-sitting position. Fits Salli Twin, Salli Classic art.no. 13577- and Salli MultiAdjuster art.no. 13578-.