Size: 45.5 * 39 * 11cm, inner diameter 19.5 * 16cmHigh-quality material: the donut pillow is made of elastic memory foam. and will not flatten or deflate during prolonged use such as inflatable pillows. It has the advantage of being highly elastic, supportive, soft and comfortable. which gives you comfort and value, distributes your body weight to the seat, reduces pressure on your lower back and coccyx and promotes proper posture and spine alignment.Ergonomics and pressure relief: memory foam cushions are ergonomically designed to provide maximum support and comfort, relieve back pain and promote the natural curvature of the spine. The seat cushion improves blood circulation and sitting posture, relieves coccyx pain and relieves the sciatica nerve.Easy to inflate: quick and easy inflation through the mouth or with the included air pump (colour of the air pump randomly). With our included air pump, you can always inflate your pillow quickly and easily. When it is deflated, it can be easily folded up for easy transport. Foldable, lightweight, portable and soft with suede surface, easy to clean, simply wipe with a damp cloth.Doctor recommended: the donut pillow helps relieve haemorrhoids, cystic pressure, ulcers, bedsores, etc. It also helps to avoid the occurrence of spinal problems and ensures a healthier sitting posture. It is an ideal item recommended by orthopaedic surgeons, chiropractors and medical professionals. It is ideal for cases of haemorrhoid complications or during recovery after surgery.Multi-purpose: Despite the dense foam, the memory foam pillow remains light enough to wear. For use in wheelchairs, home, office chair, armchairs, restaurants, stadiums, etc. The ergonomic design of the relief cushion promotes the natural curvature of the spine, good posture, relief of the coccyx and correct alignment of the hips all day - wherever you are.