This FitBall Seating Wedge is air-filled, tilting your pelvis into a posture-correcting position to help prevent slouching and back strain, while aligning the spine. Also works great as a back support. One side is smooth and the other has gentle nubs for nerve stimulation. Ideal for seats that slope down at the back such as office chairs and cars.
One side smooth for regular use & one side has gentle nubs for nerve stimulation when sitting