The uppers are made out of stretchy and breathable Flyknit fabric, and they are adorned by the brand’s iconic Swoosh symbol. There is also a classic Nike symbol that is featured on the insoles. The Nike Air VaporMax 2021 FK Black Anthracite is made out of 40% recycled content by weight. The Nike Air VaporMax 2021 FK Black Anthracite (GS) for grade schoolers has two cushioning units that are sizable yet sleek. These units sit across recycled rubber outsoles and are bolstered by recycled TPU clips.