A full-length Nike Air Zoom cushion is stitched directly to the upper. It follows the shape of your foot to give an ultra-responsive sensation and a smooth heel- to-toe transition. A second Zoom Air unit is stacked underneath the full-length Nike Air Zoom cushion in the forefoot. It helps enable movements and energy return. Lightweight and flexible, the soft upper is constructed from minimal materials for a broken-in feel. This makes it court-ready right out of the box.