Soft Material: Donut cushion is made of soft and durable PVC material. non-toxic or tasteless, reusable. Each can bear 100kg, it can used in most people .Inflatable and portable: The biggest feature of our seat cushion is that it can be inflated. We will provide you with an air pump to make it more comfortable to use. At the same time, it is also very lightweight and portable, you can use it anytime, anywhere. .Pain Relief: Inflatable Ring Cushion are ergonomically designed and medically approved, designed to be in a ring shape to allow for pain relief by distributing body weight evenly. with a weight allowance of 330 lbs., anyone can use this pillow to reduce pressure on their spine and reduce back pain. .Use Anywhere: The contours promote better weight distribution, blood circulation, posture and alignment no matter where you use it. Great For Any Chair, Car Seat, Truck Seat, Wheel Chair, Plane, anywhere you need to sit comfortably .Guarantee: If you have any problems ,please contact us for free time, we will help you do our best. .