The Nike SF Air Force 1 Mid Women's Boot delivers covert military utility in a classic hoops silhouette. It's made with ballistic nylon, premium leather and a dual-zip heel for easy entry. Versatility Standar d laces, an ankle strap and a dual-zip heel work together as a dynamic closure system. This gives you a variety of ways to wear and secure your shoe. Durable Materials The heel and tongue are made with a ballistic nylon material. This makes the shoe durable and flexible and gives it a look inspired by military field boots.