Ergonomic Design: Multi-functional padded seat cushion to give you maximum support and comfort while relieving pressure on the coccyx/tailbone and promoting healthy posture. Internal Contents Memory Foam: Made of durable, high-quality memory foam with a refreshing gel layer on top for superior comfort that can slow down rebound and provide full support, like support with both hands, and it is comfortable and simple. It will never lose its shape: Sit on our car cushion all day and never worry about it flattening. Made from high-quality memory foam that smoothly regains its shape, so it always retains its shape after each use. Gives the lower back bone the support it needs. Designed with a comfortable "U"-shaped opening, our office chair cushion protects the lower back bones from hard seating surfaces, for comfortable and appropriate sitting posture. Versatile. A great cushion for use in the office, car seat, travel, or wheelchair. Seat cushions and liners provide the necessary comfort while correcting poor posture, and they relieve coccyx pain, lower back pain / herniated disc / hemorrhoids.