Abstract: In an insole (1) for the massage or orthopedic treatment of human feet (2) that is arranged in a shoe (3), it should be possible completely to remove the bacteria, fungus and fungal spores transferred to the insole without thereby impairing the shape or the functions of the insole (1). This is achieved in that the insole (1) consists of a thermoplastic elastomer material and that the material is heat-resistant to such an extent that insole can be sterilized using hot steam or pressurized hot steam.