From T.U.K.s website When in doubt, stud it up. Take your shoe game up a notch with a dose of edgy appeal in these studded creepers. Has an all-black upper made of our high quality TUKskin™ Vegan material — polishable synthetic faux leather that is both soft and breathable. Features gunmetal spike studs throughout the vamp of the shoe and has a low sole creeper platform that measures 1 ¼” at the heel and ¾” in the front. Includes removable memory foam insoles for added comfort.