From Blundstone, the Men's 550 Water Resistant Leather Chelsea Boots feature: Premium water-resistant leather upper Steel shank SPS Max Comfort system for outstanding shock absorption Leather and synthetic lined Removable comfort footbed with XRD® Technology in the heel strike zone for shock absorption and comfort Extra set of footbeds for custom fit Cushioned midsole for comfort Lightweight and comfortable durable TPU outsole All Blundstone boots have the AU/UK size stamped on the bottom of the boot. All sizes above have been converted to US sizes; please choose your usual US size.