The invention relates to a sole construction for a shoe, comprising an upper sole part, which has channels, a lower outsole part, and an air pumping device, which is connected to the channels and which is substantially formed in the upper sole part. A phase change material surrounds a portion of an outer surface of the electrically insulating liner, a thermally and electrically insulating layer surrounds an outer surface of the PCM, with first and second fuse electrodes in electrical contact with opposing ends of the PCM. In each set of tabs, one tab includes a compression slot that extends and causes compression in a direction toward a screw hole in the opposing tab of the other set of tabs. Thus, a failsafe function for the variable ratio transmission mechanism 7 is given to the variable gear ratio hydraulic power steering device 1. The anti-slip member forms an elongate generally cylindrical member along the wire rail with longitudinal ribs on the top surface and two depending fins on the underside each on a respective side of a narrow slot by which the member is engaged over the wire.