When you sit on Egg cushion, it collapses in on itself to provide you with optimal lumbar support and comfort. Made with ultra-flex polymer, Egg Cushion cradles your tailbone. The honeycomb grid allows air to circulate through the cushion so it stays cool to the touch. It is durable for everyday use. It retains its shape even if you sit on it every day all day long Whether you need support in your computer chair, office chair, deep seat, car seat, or recliner, It can help Weve included a soft, machine-washable slip cover. When you need to clean it, just toss it in the wash.