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. PGUARD toe protector improves durability DYNAWRAP technology improves stability DYNAFIT upper improves flexibility AHARPLUS outsole rubber improves durability Rearfoot and forefoot GEL technology improves impact absorption and creates a softer feeling at footstrike DYNAWALL technology improves stability Separated outsole design helps produce more stable landings The sockliner is produced with the solution dyeing process that reduces water usage by approximately 33% and carbon emissions by approximately 45% compared to the conventional dyeing technology