Coccyx Seat Cushion Tailbone Pain Relief, Sciatica Pain Relief, Hip Support, Lower Back Support – Orthopedic PU Foam Chair Cushions for Sitting with Removable Cover. Ergonomically Designed Contour with U-Shaped Cut Out – Alleviates Tailbone/Coccyx Pain. Coccyx Cushion PU Foam provides incredible sitting comfort when placed on your chair, bench, car seat, plane seat, floor, or wheelchair etc.