Ergonomic Chair Cushion medisana seat cushion is based on ergonomics, the legs, buttocks, tailbone, physiological zone for scientific design of the six zones, targeted decompression of legs, tailbone, left and right buttocks, physiological zone, soothing spine protection.Helps to improve sitting posture and effectively relieve lower back pain and hip discomfort Size:18 *14.6*3.54 in Premium Office Chair Cushion Tailbone pain relief cushion measures 18 x 14.6 x 3.54 in and is recommended for people weighing less than 200 pounds. Seat Cushion is suitable for most office chairs, car seats, airplane seats, and home seats, improving comfort during long periods of sitting Pressure Relief Seat Cushion medisana car seat cushion is made of 100% strong support foam, good resilience, and can be quickly restored to its original shape after pressure. 3.5 in of high-density foam cushion, the material is soft and close to the body, and it can adjust the shape according to the body High-quality Cover & Anti-Slip Bottom The seat cushion's soft cover is easily removable and machine washable for hassle-free cleaning. The breathable material helps regulate temperature, keeping you cool and comfortable throughout the day. Its anti-slip bottom ensures that it stays securely in place, even on smooth surfaces, providing a stable and comfortable sitting experience Ideal for a Wide Range of Users The office chair cushion is suitable for daily office, hemorrhoids, anal surgery recovery, pregnant women, postpartum mothers, truck drivers, and people who sit for long periods of time. This donut pillow for sciatica pain relief helps relieve pain and discomfort while promoting better sitting posture Practical and Thoughtful Gift This desk chair cushion is thoughtfully designed and beneficial to health.