Enjoy the fast stability of Nike Air Zoom Structure 19 running shoes. Triple the density in the midsole creates a fit that supports your foot as it transitions through the footstrike. You'll love the smooth, sock-like fit of the breathable, inner full-mesh sleeve. With this new version comes new, exciting colors.Upper: Woven Flymesh upper provides ventilation and support where it's needed most. Yarn creates structure without sacrificing breathability. Flat, wide Flywire cables integrate with the laces and wrap the midfoot for enhanced lockdown. Internal heel counter offers a snug, secure fit. Midsole: Triple-density Dynamic Support system helps slow the rate of pronation with firmer foam along the inside midfoot and wedged foam in the heel. Removable insole. Outsole: Waffle outsole provides durability and multi-surface traction. Rubber crash rail on lateral outsole creates soft, smooth transitions. Deep flex grooves allow for more natural movement.