The improved fit on the upper is neither too tight nor too wide, so you can run any distance. The elastic cushioning protection Zoom Air offers fast and immediate high response feel during foot lift off the ground. The semi-transparent rubber sole under the heel reveals the color of the Air unit. The combination of breathable mesh and flexible fabric ensures a fit that adapts to the foot for a comfortable feel. The 2 hidden elastic straps on the tongue wrap around the arch offering ultimate support that feels like a big hug. The rubber sole provides grip and durable traction while running. The openings under the forefoot make the shoe lighter and more flexible. The soft foam offers lightweight cushioning protection under the foot. The additional layer at the toe and sides ensures greater durability at the appropriate points.