The basic principle behind the SOLESTAR design is that the insoles are optimally connected to the foot while simultaneously supporting the muscular function of the foot. This means that the torsion-resistant carbon material is used only where it is needed to support the power transfer. At places where the foot needs flexibility and comfort the cycling motion is carried out without any resistance or discomfort, supported by the flexible material incorporated in the cycling shoes. Pressure peaks are also avoided this way.