Quoted from the product page: A round cushion with a soft, springy feel. Made with approximately 7cm thick, high-density urethane material to gently and firmly support your weight. The shape has a depression in the center, which can be expected to reduce the burden on your lower back and buttocks. Recommended for desk work and remote work in the office or at home. Can also be used as a cushion in place of a zabuton on the floor, etc. Diameter 40cm x Thickness approx. 7cm / Material: 100% polyester (super micro fabric), filling/molded urethane / *If it gets dirty, wipe the dirt with a tightly wrung cloth. #FukuFukuNyanko #Cat