The [shoe] has a Sandal sole and therefore a higher Rebound-Effect. The Sandal sole has no air cylinders because the upper shoe material is open. This type of sole offers maximum effect as well as the ultimate in training performance and absorption. The foot pressure is evenly distributed and the power supply is optimised. The elastic and springy material compensates for poor postures and misalignments and the full-length sole profile with larger contact area to the ground ensures optimal grip on any surface.