Chung-shi Women's Comfort Magic Step Sport Trainer The revolutionary AuBioMo-system is available in 2 versions: Balance Step and Comfort Step. The Shank provides firmness to the sole and also ensures the foots natural rolling movement and optimizes pressure distribution over the whole sole. The comfort step has the same benefits as the balance step, but to a lower degree. The comfort step is focusing on the comfort, fast adaptation - about 2-3 days for most users - and for long wearing.