Abstract: A sole to be placed under a patient's foot inside a shoe or being part of a prosthesis or an orthosis, with the purpose of correcting a person's gait, characterised in that the sole have two or more areas of different flexural resistance. The boundary line between the different areas have a certain shape resembling an “S”. The sole is made up of carbon fibre composites, aramid fibre composites and/or other materials, and the differences in flexural resistance are achieved for example by applying composite materials with the reinforcing fibres arranged as parallel fibres, or weave, or fabric with the fibres crossing each other at different angels and in different number of layers in different parts of the sole or applying different types of fabric and weave in different areas.