USA-made and certified by the United States Air Force, this boot features a USAF Vibram 1331 outsole with Danner's classic stitchdown construction for a more stable platform and superior durability. Sage green leather. Lace to toe gives better fit and support. Sage green rough-out, full-grain leather provides toughness and the Dri-Lex lining offers rapid drying and air exchange to mitigate hot weather. Lined in 100% waterproof, breathable GORE-TEX for comfort and protection from the elements. Features 600G Thinsulate Ultra Insulation provides warmth in cold conditions.