The Nike Space Hippie 04 'Grey Volt' is an innovative addition to a collection that combines forward-thinking design with sustainability efforts. The sneaker showcases asymmetrical lacing on a knit upper crafted from Space Waste Yarn, which is derived from recycled materials such as plastic water bottles, T-shirts, and yarn scraps. Its lightweight construction is complemented by a Crater Foam midsole that utilizes both standard foam and Nike Grind rubber. Furthermore, the shoe incorporates a recycled Nike ZoomX foam insole for optimal cushioning and comfortable wear.