Lightweight Movement Flyknit on the upper gives you sock-like comfort with soft, stretchable and breathable fabric that keeps you feeling light and airy when your run goes into overdrive. Inner sleeve is minimal but stretchy. Soft in the Middle An ultra-lightweight midsole offers unreal comfort as your feet repeatedly hit the road. It’s lighter, more responsive and softer than previous versions. Stay Secure Embroidered eyestays around the laces help keep your feet secure. Pull tabs at the tongue and heel make for an easy 1-hand entry. Added Flexibility Laser-cut grooves on the sole make this shoe more flexible.