Nike's Flyknit technology replaces multiple stitched panels with ultra light and incredibly strong precision engineered knitted fibres creating targeted zones of stretch and support that won't weigh you down as you train. These Free Run 2 trainers have a tri star flex grooved midsole that expand in multiple directions, whilst the rounded outsole heel mimics the shape of your foot, for a natural range of motion and dynamic flexibility with every stride.Nike Flyknit trainersLace up fasteningAlmond toe, single seam sock like Flyknit upper, branding at vamp and tongue, cushioned tri star midsole, rounded heelFabric upper, rubber outsole