Full-length foam and Zoom Air provide energy-return and responsiveness with a smooth heel-to-toe sensation. The thicker unit in the heel is placed beneath foam for extra padding and is visible through a window in the outsole. The forefoot unit is placed right up under your foot for a quick continuous sensation. The sleek futuristic design encloses your foot in a breathable partial bootie that's covered with a shroud. Woven materials complete the look. The transparent plastic overlay along the outer side helps to stabilize your foot when quickly changing directions.