Dr. Scholl's Duragel Callus Cushion For Immediate All Day Pain Relief is specifically designed for people who have painful calluses on their feet and want discreet cushioning. A callus is caused by the buildup of hard, dead skin over an area of pressure or bony prominence. Calluses on the feet are often caused by friction and pressure from footwear as well as abnormal patterns of walking or repetitive activities (such as in sports). Dr. Scholl’s® Callus Cushions comes with Hydrogel Technology which surrounds calluses and hard skin with a thin and flexible gel that provides immediate relief from painful shoe pressure and friction. Dr. Scholl’s® Callus Cushions are soft and comfortable design that fits into most shoes easily and provides instant cushioning. The cushion helps protect the callus from further damage caused by friction, making it easier for you to go about your day without being in pain or feeling uncomfortable.