There is only one type of skin that wraps your body. The skin on your feet are not different. However, feet usually a callus (or callosity) is an especially toughened area of skin which has become relatively thick and hard in response to repeated friction, pressure, or other irritation. Rubbing that is too frequent or forceful will cause blisters rather than allow calluses to form. That is usually what protect the soles of your feet.
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