Design: Stretchy and supportive Flyknit upper creates a striking visual that's seamless, breathable and feels as light as air Traditional lacing In-Shoe Comfort: One-piece Air unit runs the entire length of a shoe, allowing for smoother transitions and adds unbelievable cushioning Designers restructured the Air unit to be attached directly to the upper; As you step down, each lug gets pushed into the Air unit, ramping up the pressure. Then, as you step off, the pressure releases creating springy bounce with superior flexibility Seamless collar sculpts the ankle and helps reduces hot spots Perforated sockliner Durability & Traction: Rubber outsole Additional Details: Weighs less than any other model of the Air VaporMax FK Made with at least 20% recycled content by weight