Seat Cushion,Thick Memory Foam Cushions for Office Chair, Car Seat, Airplane, Relieving Pressure Tailbone Sciatica Back Pain for Long Sitting Office Workers, Car Drivers 4.7in Thick Black Ergonomic Tailbone & Pressure Design — Strategically shaped cushion helps relieve sciatica, tailbone pain, hip pressure and improves posture during office work, driving, or wheelchair use 3.3" Center Thickness High-Density Memory Foam Cushion — Provides superior and comfort for hips and thighs, reducing pressure and offering long-lasting even after extended sitting sessions Removable, Breathable & Non-Slip Cover — Premium soft velvet cover is machine-washable; anti-slip bottom ensures cushion stays securely in place on chairs, car seats or wheelchairs Universal Fit for Office Chairs, Car Seats, Airplanes & Wheelchairs — Fits most standard chairs, car seats or wheelchairs — perfect for home, office, travel, gaming or daily commuting Easy Maintenance & Versatile Use — Supportive foam maintains shape over time; ideal for office work, remote learning, long drives, gaming sessions or travel — excellent for people working long hours sitting down