The New Balance 857 is a high mileage running shoe that accomodates the moderate to severe overpronator. Lightweight and supportive synthetic/mesh upper. ACTEVA midsole with ABZORB SBS in heel and forefoot, TS2 dual-density medial post provides pronation control and smooth transition through the gait cycle. Stability Web offers superior midfoot support while reducing overall weight. Dual-density medial post helps control pronation. Extended Web delivers exceptional stability and pronation control. Solid rubber N-Durance outsole adds maximum durability in high wear areas. Wt. 14.6 oz.