the invention describes a pivotable binding system for mounting between a sports device and a tread surface for a user &# 39 ; s foot , in which the tread surface is pivotable about an axis extending more or less parallel with the ankle joint of the foot and is displaceable , at least in a part region assigned to the toes , to a position closer to the sports device , and can be joined to the sports device by at least one binding element . the binding element is flexible and is resiliently deformable in a vertical plane .