This memory foam chair pad is designed to provide ergonomic support and pain relief for those who sit for extended periods. The U-shaped cushion features high-quality slow rebound memory foam and a breathable mesh cover, making it ideal for office chairs, cars, wheelchairs and school chairs. Key features: • U-shaped ergonomic design to relieve tailbone pressure • Made of slow rebound memory foam that conforms to body shape • Breathable mesh cover with non-slip rubber base • Portable design with side handle for easy transport • Dimensions: 17.7" x 13.8" x 2.8" • Suitable for adults 150-220 lbs • Firm supportive cushioning (not soft) This cushion requires a 1-3 week adaptation period for users to get accustomed to the firm support. It's specifically designed to help with tailbone pain, sciatica, and lower back discomfort by promoting proper posture and spinal alignment. The cushion can also serve as a height booster for any seat. Recommended by orthopedic doctors for its therapeutic benefits.