PRICES MAY VARY. PGUARD technology: Helps increase durability in the outsole's toe and heel area 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 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 e