The Nike Air VaporMax 2021 Flyknit "Obsidian/Light Lemon Twist" is making strides in the running world with at least 20% recycled materials and the first one-piece Air unit to run the entire length of a shoe. The predominantly grey upper is brightened with neon yellow and royal blue details, and the sole is completely transparent. The Nike Air VaporMax Flyknit 2021 employs a seamless, supportive Flyknit upper and 360-degree Air unit.