Drive Medical Posture Support Cushion with StrapTransforms an ordinary chair by providing ergonomic comfort and back support Firm yet plush for superior posture support Helps reduce discomfort in the head, neck, shoulders and back Ergonomically designed to promote proper spinal alignment Attached strap helps keep cushion securely in place Great for home, office and traveleven in the car Also great for use behind the knees and ankles Compressed foam automatically expands to full size when removed