I had two of these, so this one is in excellent condition as I haven't used it much. This is a donut-shaped cushion made of breathable mesh material. Original price: 5400 yen - Shape: Donut-shaped - Material: Mesh material Brand: LOOKIT Color: Dark gray x gray (mesh) Filling material: Polyethylene Manufacturer: Netforce Product dimensions: 40 cm length x 40 cm width Unit count: 1.00 piece Size: Diameter 40 x Height 7.5 cm Fabric: Polyester / Cushion: Polyethylene [Air Fiber] Same specifications as those used in hospitals! Velcro prevents the U-shape from spreading, preventing the affected area from touching the seat. Thank you for viewing.