Description: Instant Relief From: Hemorrhoids, hip bursitis, broken tailbone, herniated discs, bed sores, anal fissures, ischial tuberosity, fractured coccyx, pressure related to childbirth, vaginal surgery, and sitting for long periods of time that can cause lower back, hip, leg painMachine Washable Removable Cover: Waterproof inner. Use it again and again, on any seat and any occasion. Simply remove the cover when it is time to freshen up.Widely Used: This sitting donut pillow fits most office chairs, gaming chairs, desk chairs, computer chairs, standard dining chairs, car driver seats, couches, wheelchairs, and recliners. Lightweight and Portable: Use in your home office as a donut seat cushion for tailbone pain, on the road as a car seat cushion or as a wheelchair cushion. Ergonomic: Shaped like a doughnut with an Ergonomic. our pillow conforms to lower body contours providing natural support Size Chart: M:Outer diameter 33cm/12.99inch Inner diameter 12cm/4.72inch Thickness 8cm/3.15inchL:Outer diameter 40cm/15.75inch, Inner diameter 15cm/5.91inch, Thickness 9cm/3.54inch Package Includes: 1 pieceDonut Pillow Cushion Note: 1. Please allow slightly error due to manual measurement.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.3. Wish you a wonderful on-line shopping!