Our products have been designed to work with the unique contours and skin conditions of the feet. The design of the Sole-magic Foot Smoothing pad came about when Co-founders Cheryl Fisher and her husband Mike Haider became frustrated with the lack of effectiveness in foot smoothing products. None of the Pumice Stones, Foot Files, or even metal graters could provide smooth results. This was a real problem. So, instead of being hard and inflexible like all of those other products, Sole-magic was designed to be soft & flexible...it actually conforms to the shape of the foot resulting in smooth feet instantly...Problem solved!