Full Grain Premium 2.2mm Cowhide Waterproof Leather Oil & Acid Resistant Outsole with Non-Skid & Non-Marking Tread Back Zipper with Square Toe Design, Welt Construction Back Zipper Entry W Milwaukee Signature Hardware Smart Mask Climate Control Insole with FlexPower Toe Design Linings are Moisture Wicking, Anti-Fungle, Anti-Bacterial