Description Leather and Perspair® Upper: The leather upper has side panels made of Perspair®. PU-coated nylon thread is woven to create a material that is extremely lightweight and breathable while remaining incredibly durable. Waterproof Danner® Dry: 100% waterproof barrier allows moisture to escape without letting water in, keeping your feet dry and comfortable all day long. USAF Optional Wear: Meets US Air Force AFI 36-2903 requirement for optional wear. TAA Compliance: Danner supports the Trade Agreement Act, and because of that, this product is made by a TAA–designated country. US ARMY Optional Wear: Meets US Army AR 670-1 requirements for optional wear. Speed Lace System: Our special hardware allows you to tighten from toe to top with one swift tug for a secure, tight fit. Resurge Midsole: The lightweight EVA midsole provides comfort and energy return for agility and fast-paced movement. Danner® Sonic Outsole: The Danner® Sonic outsole stands up to almost any kind of terrain with its high-abrasion rubber and multidirectional lugs.