The Sit’n’Gym ball has little feet to prevent them from rolling away when used as a sitting ball. Widely used in European kindergartens and classrooms, the Sit’n’Gym encourages dynamic sitting through gentle body movements that improves blood circulation increasing the child?s attention span conducive to better learning. It also promotes proper body alignment for better posture. Adults can use it as an alternate chair when working at their desk. Can also be used as a regular exercise ball. Super strong latex-free vinyl material is surface-washable.