1.[Increased Comfort] You shouldn't have to live with discomfort any longer if you find that you can't sit still for extended periods of time due to tailbone issues, an accident, or recovery from surgery. Any hard surface becomes more comfortable with this seat cushion, which reduces the pressure. It measures 17.3 x 14 x 2.76 inches, large enough to fit all. 2.[Orthopedic and Ergonomic Shape] A well-considered coccyx cushion cutout is a suitable donut pillow for tailbone comfort if you face back issues. It is also useful as a back support, office chair cushion, and sitting pillow. Please consider that, although many people find this cushion helpful, its efficiency varies from person to person, and it may not help you with all types of conditions. 3.[ and ] It is convenient to take this seat cushion with you as it is lightweight and portable. It can be useful as a wheelchair cushion, a car seat cushion for travel, or a donut seat cushion for increased comfort in your home or office. 4.[High-Quality Materials] This seat cushion is made from high-density memory foam as a filling and has a resistant and breathable fabric cover for comfortable and long-term use. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.