pediped Flex Nancy Fashion Boot (Toddler/Little Kid/Big Kid) Leather Synthetic sole Shaft measures approximately 6.25" from arch Heel measures approximately 0.75" Boot opening measures approximately 8.5" around Lightweight, flexible sole Comfortable, breathable leather lining Velcro strap for adjustability Approved by the American Podiatric Medical Association for promoting healthy foot development Endorsed by researchers associated with Children's Hospital Boston and Harvard Medical School