moleskin /(mōl"skĭn)/

mole·skin

moleskin

n.
  1. Any fabric having a thick soft shag, like the fur of a mole; esp., a kind of strong twilled fustian.
  2. A soft fabric having an adhesive backing, applied to the skin at points susceptible to abrasion, as on the feet, to prevent irritation or blistering during exercise, such as hiking.