The design of the Nike ISPA Link Axis uses interlocking components to use as few materials as possible and no glue, in line with the principles of modularity and waste reduction. The shoe offers a look and feel that has been developed with the same thoughtful approach. The underfoot feel, emphasized by the mechanical Nike Air cushioning, provides responsiveness and the perfect amount of bounce. Even the sporty colors are purposeful: They're a nod to the very first Link Axis prototype, now on display in a museum exhibit about the future of circular design. It's a reminder of the Nike ISPA promise: constant progress towards the eternal shoe.