The New Balance 904 is a lightweight, low-profile running shoe that provides added medial stability while maintaining a smooth responsive transition. Air mesh upper with NLock® integrated lacing and webbing system delivers optimal fit, support and security. Sure Lace™ is a computer knit lace/chord designed with a reciprocating wave pattern that will not untie under high performance or inclement conditions. TS2® Transitional Support System creates a smooth transition from heel strike to toe-off. ACTEVA™ Ultra Lite midsole with optimal compression set properties. Stability Web® structured lightweight arch support provides optimal rigidity preventing midfoot flex. NDurance® outsole gives maximum durability in high wear areas. Blown rubber forefoot, forefoot flex grooves. Wt. 9.9 oz.