Insoles Sidas Merino Winter Custom RaceABOUT SIDAS MERINO WINTER CUSTOM RACE INSOLES Can be used alone but is most often stabilized with Heel stabs or Transflux reinforcements. This is a comfort solution, not a medical orthosis. HOW TO USE Cut out the sole before use Remove the insole and replace it with the new one. Washing with soap and brush only Do not dry on a radiator, for a better drying use our shoe dryers.