The more the rubbing, the thicker the callus tends to form.
While wearing Sole-Mates Insoles, your feet float on top of a flexible surface of glycerin almost like “walking on a water bed”. As your feet float, rubbing is eliminated and there is no longer any friction between your sole and your shoes. No irritation = no need for the protection of a callus. Over time existing calluses will simply disappear as your feet return to their natural healthy state that comes from restoring a natural healthy environment for them.