From Flag LTD., the Men's Nathan Leather Zip Boots feature: Leather upper Leather lining Featuring exclusive inno Vent ™ insole board technology with a breathable EVA Flex Zone "High Rebound" removable polyurethane comfort footbed with Nappa Glove leather lining Featuring exclusive inno Flex ™ technology with a genuine leather outsole with gel rubber injection islands in the forepart for traction and stability Made in Brazil Imported.