Blundstone Unisex Super 550 Series Boot 100% Leather Imported Synthetic sole Shaft measures approximately 6" from arch Heel measures approximately 1.5" Boot opening measures approximately 10" around Model 585 is part of the Super 550 Series of Blundstone boots. Removable insole Steel shank Poron xrd shock protection in heel-strike zone Tpu outsole and pu midsole for longer wear and comfort Premium leather upper