Let's go! It's time to be the boldest and the fastest with the Nike Air Vapormax 21 FK. The result of a seven-year journey from ideation to release, the Air VaporMax represents a new era in Nike innovation. “Running on Air" is what you'll feel like because of the restructured Air unit that's attached directly to the upper. As you step down, each lug gets pushed into the Air unit, ramping up the pressure, and as you step off, the pressure releases to give you a springy bounce with superior flexibility. Something for you, something for the planet. The speckled outsole is made with recycled Nike Grind materials to bring you one step closer to a greener planet and a better running experience. Revolutionize your runs with the Nike Air Vapormax 21 FK. Nike Air Vapormax 21 FK features: Supportive Flyknit upper crafted from stretchy yarns offers striking visuals with a snug, breathable, and flexible fit. Heel-to-toe VaporMax Air ensures smoother transitions and unbelievable cushioning. Speckled outsole delivers optimum traction and durability.