✅ Pressure Relief Orthopaedic Wheelchair Seat Cushion | Lower Back, Sciatica & Tailbone Support | 22"x22"x4" | Waterproof Cover. Upgrade your comfort with ourOrthopaedic Pressure Relief Seat Cushion, specially designed to support yourspine health and relieve pain fromlower back issues, sciatica, and tailbone discomfort.