Orthex Symbia 2.5" Posture CushionOrthex Symbia 2. 5" Ergonomic Seat Cushion If you spend long hours sitting, your lower back knows it. The Orthex Symbia 2. 5" posture cushion is designed to fix the root cause: a tilted pelvis that flattens your lumbar curve and puts pressure on your discs. It works on any chair, car seat, or office seat. What It Does Pelvic alignment: Positions hips slightly above knees to restore the natural lumbar curve Pressure redistribution: Distributes your