Blundstone Women's Blundstone 063 Black Boot 100% Leather Synthetic sole Shaft measures approximately 4 1/2" from arch Heel measures approximately 1 1/2" Platform measures approximately 1" Boot opening measures approximately 8" around New TPU outsole-PU midsole for longer wear and comfort Premium Leather SPS Max Comfort shock protection Poron XRD in the heel-strike zone Steel Shank