Premium Memory Foam:Our office chair seat cushion is made of 100% pure memory foam, soft and firm, uses your own body heat to adapt to your curves, ergonomic "U" shaped hollow design for superior comfort, effectively support the coccyx, relieve the hip pressure caused by sitting for long periods Convenience:Non-slip rubber bottom keeps the butt pillow in place even when moving on the seat. The machine washable zippered breathable cover is easy to clean, just remove the cover and toss in the washing machine. Built-in handle for easy transport Multiple Uses:This office chair cushion fits all types of chairs, great for office chair, car seat, airplane seat, gaming chairs, bleacher, wheelchairs. Comfortable for business travel, sporting events, or elderly Material Safety:All parts of the seat cushion are certified safe and harmless for human health with no additives. The premium memory foam of this seat cushion quickly rebounds and returns to its original shape after each use and can be