Ergonomic X-Large Design: Memory foam cushion with U-shaped hollow design fits body contours for ultimate comfort. Xl size ensures full support, reduces pressure from long-term sitting. Premium Memory Foam: Adapts to body shape with personalized support and slow rebound technology for lasting comfort in all seasons. Tailbone Pain Relief: Warped edge design supports lower back and hips, relieving sciatica, coccyx pain, leg numbness and fatigue. Improves posture and relieves stress from prolonged sitting. Suitable For Most Chairs: Universal fit for office chairs, car seats, airplane seats, gaming chairs and wheelchairs. Non-slip bottom ensures stability. Surprise Gift: Beautifully packaged, thoughtful gift for loved ones. Weight: 2.27 pounds.