Feature:The advantage of this cushion is its unique design which is like holding your back with two hands. It is designed according to the Angle of the body's healthiest sitting position. The inner at the bottom is thickened so that there is no gap between the waist and the chair and it increases support. The seat cushion can be used not only in a chair, but also in a car, with a rear strap to prevent random movement during use. The outer cover is 82%cotton,13%polyester,5%spandex made, each memory foam is protected by a lining of breathable fabric, which is 100% polyester made of.