Sneakers are quickly growing into a $90 billion business–but they’re all built the same way, more or less, constructed out of a combination of soles and uppers. Nike has React and Flyknit. Adidas has Ultraboost and Primeknit. What if we could replace just part of a shoe, rather than the whole thing? It could be greener, cheaper, and more customizable, too.
Image: https://www.fastcompany.com
