The Posture-Flex orthopedic coccyx cushion is expressly designed to relieve leg, lower back, and tailbone pain associated with sciatica, poor posture and extended periods of sitting. By reducing pressure on your tailbone, the rear-cutout coccyx cushion enables the muscles and nerves in your lower-back to relax while improving circulation. Premium quality foam that ensures both a great fit and long term reliability. Can be used in your office, car seat, as a floor pillow, and fits nearly every kind of seat.