The Nike Space Hippie 04 features is made of at least 25% recycled material by weight, which is the lightest model from the collection and also has the lowest carbon footprint. This offering features a Grey “Space Waste Yarn” upper that includes about 75% recycled content by weight-made from recycled plastic bottles, t-shirts and yarn scraps. Finishing off the design is the models signature Crater Foam midsole.