The GEL-RESOLUTION™ 9 tennis shoe creates advanced stability and cushioning for players who like to control the game from the baseline. ​ ​ DYNAWALL™ technology in the midsole now extends into the heel for added stability during lateral movements. It's a functional feature that's effective when you're running covering both sides of the baseline.​ DYNAWRAP™ technology in the eyestay has been strategically redesigned to apply pressure when extra support is needed. This allows you to experience a locked-in feel when you're making quick transitions.​ Lastly, the full-length outsole and separated heel help produce a more stable landing for quicker recoveries in between shots.