Nike The Men's Nike Air VaporMax 2021 FK Shoes blend modern design and classic elements for one striking shoe. Made with a FlyKnit upper, the Nike Air VaporMax 2021 provides breathable support and stretch to keep you feeling comfortable throughout the day. With the one-piece Air unit running the full length of the shoe, the Nike Air VaporMax 2021 offers smoother transitions and greater cushioning compared to other versions.