Size:45*40cm The design fits the ergonomic design of the buttocks, the tail is not tired after sitting for a long time, and the lumbar spine is restored to health. Feeling is also very important. It is not like an ordinary seat cushion, but an ordinary curved surface design with high thigh bone and low middle. Such an ergonomic design can fit the contours of the human body from a charming figure. Because the contact surface between the cushion pad and the buttocks is deeper than the contact surface when you sit down, the pressure on the spine can be better dispersed, keeping it natural and comfortable and not tired. Mat is a circle wider than the normal sitting posture. If a tall person sits on a cushion, the body can also have a comfortable feeling of being firmly supported.