18"x18" Round High Quality Corduroy Super Soft Polyester Cotton Chair Cushion Thickened Office Seat Cushions Mat Pad for Home Office Kitcken(Green) Polycotton SIZE:18"x18"/45cm*45cm(2-3cm measurement error). With a little Lover Keychain as free gift. Generously filled with soft polyester cotton, durable and breathable Sized to fit most chairs, can be tied to the chair Ideal for car, plane seats, office, kitchen, computer, sofa and any other chairs and very comfortable to sit on. Seat cushion can disperse pressure evenly, and relieve muscle fatigue, superior comfort for chairs, car seats, planes, and wheelchairs