Mens nike flex 2016 rn running shoe flexibility defined top to bottom the mens nike flex 2016 rn running shoe is built to flex its one piece engineered mesh upper co molded midsole and molded tri star outsole pattern work together for a smooth ride that moves with your stride engineered mesh upper supports throughout your stride co molded midsole delivers a smooth ride tri star outsole design flexes as your run flywire cables offer a dynamic supportive fit through the