18 x 14.5 x 3 inches. ‘The Foam Ring Seat Cushion is a comfortable and supportive seat cushion that is ideal for people that sit down for long periods of the day. It is well padded with high-quality foam that redistributes the user's weight to ensure localised areas of pressure do not build up. The oval design incorporates a large central recess that accommodates the posterior and coccyx to prevent any possible points of pain. The cushion promotes better posture and comfort. It is ideal for individuals recovering from surgery, dealing with haemorrhoids, or experiencing back pain. The seat cushion is supplied with a removable zipped cover that can be washed.’ VGC from smoke free, pet free home. Feel free to ask for more photos/info