The Nike Space Hippie 04 “Iron Grey” is part of the brand’s exploratory footwear collection constructed with Nike’s own “space junk.” Composed of at least 25% recycled material by weight, this iteration of the model dons dark grey/black “Space Waste Yarn” uppers with embroidered white Swooshes. According to Nike, the “Space Waste Yarn” uppers include about 85% recycled polyester – made from recycled plastic bottles, t-shirts and yarn scraps. Finally, its signature speckled Crater Foam tooling in white rounds out the design.