How do you make the most sustainable shoes? The ecologically minded French sneaker brand Veja recently revealed how they make their ethical kicks, and the entire process is mesmerizing. Instead of using cheap plastics, every component of their sneakers is obtained from a sustainable source, whether it be the rubber made using traditional techniques in the Amazon or the leather-like material made from curdled milk. Take a look here to see what it takes the most sustainable sneakers in the world.