Square seat cushion approximately 4cm thick. Can be used in the office or car, or as a zabuton (floor cushion) on chairs, sofas, floors, or tatami mats. The top surface uses a smooth fabric that can be used year-round, while the sides and back use a smooth, glossy velour fabric. This cushion is convenient for use at home, in the office, or in the car. 【Dimensions】 Width: 40cm / Depth: 40cm / Height: 4cm 【Materials】 Surface fabric (top): 100% polyester / Side fabric (velour): 100% polyester / Filling: Urethane foam 35D I bought this for home use, but I opened it only because I made a mistake with the size.