The Nike Air VaporMax 2021 FK White Black Metallic Silver and Flyknit 'Monochrome' are thoughtfully crafted shoes designed for comfort and sustainability. Notably, both models are constructed with 40% recycled materials. The FK White Black Metallic Silver features a stretchy FlyKnit upper made from recycled yarn, a soft collar, modern webbing eyestays, traditional lacing, and heel padding for added comfort. It also includes Nike Grind rubber details for improved traction and durability, supported by the revolutionary VaporMax 2 Air unit. Meanwhile, the Flyknit 'Monochrome' combines buoyant cushioning with a sustainable build, also featuring 40% recycled content. It showcases a pale grey Flyknit upper, a black stitched Swoosh, a stretchy sock-like cuff, and a molded heel clip for stability. Both designs utilize a lightweight construction and rest on a one-piece VaporMax unit with a speckled Nike Grind outsole.