These Nike Flex RN 2019 running shoes bring stretch to your run with every step.SHOE FEATURESStretchable knit upper wraps you in softness as it expands and contracts along with your footDual-density foam layers supply durable cushioned comfort, while hot-knife grooves on the outsole give you flexibility heel-to-toeExtured for traction heel-to-toe with hot-knife sipingHeel and tongue loops stretch the opening so your foot easily slides inSHOE CONSTRUCTIONKnit upperFabric liningRubber outsoleSHOE DETAILSRound toeLace-up closureFoam footbedNew with out box