Updated for a more secure, stable and comfortable fit, the Nike Zoom Fly 4 in BlackWhiteAnthraciteRacer Blue makes it even easier to find your tempo in this durable, fast and propulsive training shoe. The Nike Zoom Fly 4 uses a new Flyknit material around the collar giving you extra stretch for a sock like feel with an easy on off. It combines with a lightweight mesh upper for a softer, more breathable feel.Improved midfoot support is created by using 4 individual pieces of webbing intertwined with the laces that tighten and provide support as you lace up. An additional internal heel pod provides a more secure fit than the Zoom Fly 3. It still uses its durable engine room combination of React foam and carbon fibre plate in the midfoot to provide a smooth, responsive ride with a flexible stride that will have you training hard, and more stable than before. Nike Flyknit material is placed around the collar, providing extra stretch for easy on and off. It has a socklike feel that helps contain your foot and feels secure. The upper is made with lightweight mesh for a softer, more breathable feel that conforms to your foot. Midfoot support arrives courtesy of 4 individual pieces of webbing that intertwine with the laces. When you lace up, the shoe gets tighter, giving you stability. An internal heel pod delivers a more secure fit than the Zoom Fly 3. Nike React technology is a lightweight, durable foam that delivers a smooth, responsive ride. It combines with an internal carbon fibre plate for flexibility in your stride.