Incredibly light wear. Near perfect tread. Worn twice. Some slight dust. Great show that has not been “broken in” or had the integrity of the footbed degrade from wear. Great find! More robust and lighter than previous versions, the Nike Air Zoom S t r U c tu r e 21 women's running shoe ensures the stability and support that have made it one of the favorite models ever. Flymesh material, softer and lighter, keeps your skin cool while Nike Zoom Air responsive cushioning on the forefoot ensures maximum elasticity under the foot. The one-piece Flymesh fabric ensures ideal breathability on the back of the foot. Despite the lightest materials, this type of Flymesh provides solid support. Born from the union of Flywire and inner band on the arch of the foot, dynamic fit technology provides stability that adapts to your foot. The top two eyelets are strong and lightweight Flywire cables that attach to the laces for an ideal support when you fasten your shoe. In addition, the elastic band wraps around the arch to prevent the foot from slipping into the shoe while running. The wide and flat sole and two types of cushioning ensure maximum stability. The stiffer foam protects the inner side of the arch while the softer one protects the outer side for ideal shock protection and maximum stability while running.