The [shoe] has a Cirrus sole and therefore a lower Rebound-Effect. This sole has an improved profile for squeaky floors and a «kybun light» feeling with less initial reactions. Therefore this type of sole offers a slightly reduced intensity and effect. That is exactly why the sole is ideal for people with weaknesses in the muscular system or balance disorders. Furthermore, it has an ideal fit for almost every foot. Also for all exercise fanatics, who don't want to miss the kybun shoes during sports activities. Perfect for sports such as tennis, volleyball, jogging, etc., where it is less about the winning and more about pain-free movement. The sole has no air cylinder but nevertheless the optimal kybun grip on all floors.