Omaking insole in wool and aluminum for barefoot shoes. The upper part is made of warm and soft wool fleece The middle layer acts as a heat insulator The bottom layer is made of aluminum, which effectively prevents cold from entering the shoe while keeping moisture away. Cut to the right size yourself Size chart: 25-34 length 22 cm, width 9.0 cm 35-41 length 26.5cm, width 10.0 cm 42-47 length 30.5cm, width 11.0 cm 48-51 length 32.8 cm, width 11.4 cm We recommend removing the insole from the shoes after use to air and dry.