CushionMax &ndash; Premium Ultra Thick (3.6 Inches/9cm) Coccyx Orthopedic Seat Cushion with Proper Firmness Ergonomic Memory Foam Contour Covered with Breathing Vents Velvet &ndash; a Perfect Cushion for People Suffering Tailbone Pain, Lower Back Pain, Sciatica Pain Etc. Alleviates Pressure Points, Disperses Body Weight & Promotes Good Posture. King/queen Size Available &ndash; 1 Year Hassle Free Warranty &ndash; Cushionmax Never Lose Shape. (Navy Blue, Queen)