A product, e.g. an insole for a shoe, fitting onto a persons foot sole based on a platform (SM) of a flexible and electrically isolating material. Multiple stimulation electrodes (S1, S2, S3) with adhesive stimulation areas of at least 1 cm2 are spatially distributed on the platform (SM). A conducting and adhesive ground plane electrode (G) with at least an area of 10 times a stimulation electrode area is arranged for contacting the persons foot. An electric interface (I) comprising a plug or socket with externally accessible electrical connectors to allow external individual electrical access to the plurality of stimulation electrode areas (S1, S2, S3) and to the ground plane electrode (G). The electric interface is capable of handling at least a voltage of 200 V, preferably 400 V. Such product is suited for reflex-based gait therapy, where the persons withdrawal reflex is triggered by a painful stimulation of the persons foot sole. Many distributed stimulation electrodes allow individual fitting for optimal stimulation, and low cost sensors built into the product may be used to provide feedback regarding the gait phase, i.e. the product is a one-time use insole suited for easy and hygienic gait therapy in a clinic.
