Product Details + Full Grain Premium 2.2mm Cowhide Waterproof LeatherOil & Acid Resistant Outsole w/Non-Skid & Non-Marking TreadBack Calf Lacing Detail, Welt ConstructionSide Zipper Entry w/ Milwaukee Signature HardwareSmart Mask Climate Control Insole w/ Flex Power Toe DesignLinings are Moisture Wicking, Anti-Fungal, Anti-Bacterial