The MR859 is a high stability running shoe that features our ABZORB SBS cushioning technology along with our TS2 and extended web stability web for medial support to offer both a smooth and cushioned ride. ABZORB SBS Heel and Forefoot Provides maximum shock absorption ACTEVA Midsole Greater consistency in cell sizelower density of cellular foam structure increases resistance Blown Rubber Outsole Provides a lightweight cushioned ride. Ndurance Outsole Provides long-wearing durability. NLOCK Support Designed to provide upper midfoot structure and enhanced support. Transitional Support System Provides optimal support while enhancing transition from heel strike to forefoot.