Fit Note: This shoe runs narrow. We recommend sizing up a half size or purchasing your usual size in Wide. PGUARD technology: Helps increase durability in the upper's forefoot inside area DYNAWALL technology: Helps improve stability DYNALACING technology: Helps create a stable fit during dynamic movements AHARPLUS outsole rubber: Improves durability Forefoot GEL technology: Improves impact absorption and creates a softer feeling at footstrike