NIKE Air Max Tailwind+ 4 Running Shoes New Flywire Technology - ultra lightweight and very strong this new fabric gives great support without weighing the shoe down or compromising on comfort Low-profile Air-Sole units at the heel and forefoot for lightweight cushioning, taking the strain off your joints. A breathable mesh upper - keeps your foot dry from sweat but yet secure. Deep flex grooves at the outsole for a more natural range of motion and flexibility, meaning the shoe moves with your feet. Durable TPU underlays add extra support without sacrificing flexibility, reducing the risk of injury.