END TO END ENERGY. If you want to be a complete player, you have to make an impact on both ends of the floor, from tip-off to the final buzzer. The KD13—built with a full-length Zoom Air unit stitched directly to the upper and an additional Zoom Air unit in the forefoot—provides the responsiveness and optimal energy return to help you make big-time plays all game long. Full-Length, Close-to-Foot Cushioning Stitched directly to the upper, a full-length Nike Air Zoom cushion follows the shape of your foot to give an ultra-responsive sensation and a smooth heel-to-toe transition. Double-Stacked Zoom Air 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. Broken-In Comfort The soft upper is lightweight and flexible. It's constructed from minimal materials to give it a broken-in feel, making it court-ready right out of the box.