The outsole has at least 13% Nike Grind material, made from scraps from the footwear manufacturing process. Flyknit gives you sock-like comfort with soft, stretchable and breathable fabric that helps keep you feeling light and airy when your run goes into overdrive. Inner sleeve is minimal but stretchy. An ultra-lightweight midsole offers unreal comfort as your foot repeatedly hits the road. It’s lighter, more responsive and softer than previous versions. Embroidered eyestays around the laces help keep your feet secure. Pull tabs at the tongue and heel make for an easy 1-hand entry. Laser-cut grooves on the sole make this shoe more flexible.