The [shoe] has a Tropo sole and therefore a lower Rebound-Effect. The Tropo sole (successor of the popular Cirrus sole) has all the advantages of the previous models on the Cirrus sole. This sole has an improved profile for squeaky floors and a «kybun light» feeling with less initial reactions. The Tropo sole is designed to roll better in the backfoot area than the Cirrus sole. Furthermore, it has an ideal fit for almost every foot. This type of sole offers a slightly reduced intensity and effect. With its «kybun-light» feeling, it is ideal for people with weaknesses in the muscular system or balance disorders. 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.