pediped Flex Kenadi Casual Boot (Toddler/Little Kid/Big Kid) 100% Leather Rubber sole Shaft measures approximately 7" from arch Heel measures approximately 0.75" Boot opening measures approximately 8.75" around Approved by the American podiatric medical association for promoting healthy foot development Features the flex fit system(TM), which allows children to adjust the fit of their shoes and prolong the length of wear