Design: Details like graphics on the laces and a multicolored Swoosh add a twist on the look of the classics Internal heel pod helps keep your foot comfortable, while delivering a better, more secure fit than the Zoom Fly 3 Upper is made with lightweight mesh for a softer, more breathable feel that conforms to your foot Nike Flyknit is placed around the collar, providing extra stretch for easy on and off Four individual pieces of webbing that intertwine with the laces help with midfoot support FlyKnit also offers a sock-like fit to help contain your foot In-Shoe Comfort: Nike React technology is a lightweight, durable foam that delivers a smooth, responsive ride React technology combines with an internal carbon fiber plate for maximal flexibility in your stride Additional Details: Previous version: Zoom Fly 3