Helps to relieve lower back and tail bone discomfort. Helps to prevent ulcers and the discomfort from hemorrhoids or episiotomies. Conforms to the body, contours to provide comfort and support when sitting for long periods of time. Easily inflates and deflates with metal twist valve. Cleans easily with a damp cloth. Convenient for home, car, or workplace. Made of durable heavy-gauge natural rubber.