Fans of Andre Agassi's signature Nike Air Tech Challenge have something to look forward to this summer: namely, the return of the Air Tech Challenge IV in its original form. That means shoe's leather and nubuck construction, vivid coloring and mid-stop silhouette are all present. Re-live a time when mullets and acid-washed shorts upended the cloistered world of professional tennis, and expect the Nike Air Tech Challenge IV to hit stores in July.