Memory Foam Seat Cushion: The BUFORT office seat cushion and lumbar support pillow features premium slow-rebound memory foam that adjusts to your body's curves for better support, reducing pressure on your coccyx and promoting healthy sitting potential. The mesh breathable cover provides good air circulation, so you won't feel stuffy or sweaty when you sit. Say Goodbye to Coccyx Painful: An orthopedic doctor's recommendation - the perfect alternative to donuts and hemorrhoid pillows. The ergonomically designed U-shaped seat cushion keeps the hips and tailbone away from the hard seating surface, preventing pressure on the lower body, can effectively relieve sciatica, arthritis, lower back, hip, spine, post-operative injury or pregnancy pain relief, suitable for 150 - 250 lb crowd. Extra Larger Size Back Cushion Pillow: BUFORT desk and chair back cushion has a larger support area than other brands. Simulating the human spine curve and takes on the natural contour shape o