The back and side supports adjust in height and width to give optimal vertical alignment for the pelvis and trunk. Adding this accessory assures that when a child is seated on the Scoot-About, the seat depth supports the entire thigh on the seat surface. The adjustable height of the posterior support maintains the pelvis in a vertical position and the adjustable lateral supports minimize asymmetry of the trunk. This accessory makes the Scoot-About a useful mobile seat for children as they practice propelling themselves with their feet. This accessory is removable so that the Scoot-About can still be used by parents and therapists. Attaches to any Kaye Scoot-About, model SB-1.