Made with at least 40% recycled content by weight, the Nike Air VaporMax 2021 FK "Dark Grey/Black/Barely Volt/Phantom" Grade School Boys' Shoe defines innovative comfort. Superstretchy and supportive Flyknit fabric feels like wearing a sock, plus VaporMax Air from heel to toe gives you ultra-lightweight bounce. Flex into the future with us and feel the good vibes. <ul> <li>Nike Flyknit technology uses strong (yet lightweight) yarns to create a knit fabric that feels supportive, stretchy and breathable.</li> <li>VaporMax 2020 Air evolves from multiple Air units into one big bubble from heel to toe for super lightweight and flexible cushioning. The bottom includes some Nike Grind material that's made from scraps from the footwear manufacturing process.</li> <li>Wear these ultra-comfy shoes knowing you own kicks that can claim they're made with at least 40% recycled content by weight. Now that's a good look.</li> </ul>