The Addiction 7 is a lucky charm, with the support required by runners with low or flat arches, along with the control, stability and cushioning known and loved by severe overpronators. Heel and forefoot HydroFlow ST-XL provides the best cushioning system in footwear. It absorbs shock, stabilizes the foot and returns energy back to the foot. Exclusive full-length S-257 midsole decreases break by 15% while providing excellent energy return and cushioning on every stride. New, extended Progressive Diagonal Rollbar to stabilize the foot minimizing excessive pronation. Internal support saddle. Air Mesh uppers.