The Nike Space Hippie 04 'Iron Grey' is part of Nike's innovative footwear collection that focuses on sustainability and minimizing carbon emissions. The upper of this shoe features a unique heathered grey design, created using Space Waste Yarn, which is made up of 85% recycled polyester. This polyester is derived from a combination of recycled plastic bottles, t-shirts, and yarn scraps. Adding to its distinctive appearance, the bulky midsole is constructed from a blend of Nike grind and standard foams, and is adorned with multicolor flecks. By utilizing recycled materials and reducing waste, the Nike Space Hippie 04 'Iron Grey' embodies the brand's commitment to environmental consciousness.