NIKE AIR FUTURUNUPPER: Open mesh for breathability with strategic over lays for support. MIDSOLE: Dual density Phylon midsole with a softer density foam in the heel crash pad wrapped by firmer density foam combined with Air Sole unit in the heel. OUTSOLE: Environmentally preferred rubber in a modified Waffle outsole for better traction. Flex grooves in the frorefoot for improved flexibility. Ideal for the everyday runner. A shoe with a smooth, well cushioned ride for training runs and a bold, youthful design at an excellent value.