New, Unused Insoles Walking Teacher Insole Slim 4L Fits sizes approximately 27-27.5cm "Walking Teacher Insole Slim" is a walking correction insole developed in joint research with Hiroshima University. A special gel line naturally guides the ideal weight transfer of the foot (heel → outer arch → between the big toe and index finger). The approximately 6-degree slope of the gel material at the toes encourages grip of the toes, achieving a firm push-off. The characteristic squishy gel material powerfully supports walking. Stored at home 3-001-0