The Nike Flyknit Lunar1+ is a Nike+ ready ultra lightweight running shoe (that was developed by Nike programmers, engineers and designers over a four year period), with a tightly woven nylon one piece upper (that varies in density allowing different levels of flexibility, ventilation & support in targeted areas), built on a Lunarlon midsole (Lunar foam was designed by NASA and offers lightweight cushioning which spreads stress throughout the entirety of the form rather than compressing at the point of impact), with a durable blown rubber outsole and additional dense rubber tread pads.