Lightly Used. 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 forefoot has been strategically designed to hold 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.