The Nike Air VaporMax 2021 FK is all about comfort. Its super stretchy Flyknit upper is breathable and lightweight while a soft seamless collar sculpts your ankle for a sporty look. Heel-to-toe VaporMax cushioning underfoot helps put a bounce in your step, and a stitched-on Swoosh logo and plastic heel clip add a splash of futuristic style. Benefits Supportive Flyknit upper is made from stretchy yarns and creates a striking visual that's seamless, breathable and feels light on the foot. Full-length VaporMax Air unit was the 1st Air unit to run the entire length of a shoe. It allows for smoother transitions and adds plush cushioning. Seamless collar sculpts the ankle for a sporty look that feels great while padding on heel adds to the comfort. Webbing eyelets add a modern look. Rubber on the outsole adds durability and traction. Speckles on the outsole are made from Nike Grind, which is recycled waste (i.e., the scraps) from the footwear manufacturing process. Nike Air VaporMax After the 7-year journey from ideation to release, the Air VaporMax represents a new era in Nike innovation. To truly capture the feeling of “running on air,“ the 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. Made for runners, the futuristic technology was quickly adopted by the street, bringing this light-as-air feeling to the masses.