Step & Stride Aragon Pull-On Boot 100% Polyurethane + Nylon Synthetic sole Shaft measures approximately 4.5" from arch Boot opening measures approximately 8.75" around Magic Flex notched outsoles for steady traction and flexible movement Magic Cushioning dual density outsole for cozy comfort and support Easy on/off for when you need your little one dressed and out the door in a hurry Magic Wick insole with odor fighting OrthoLite technology