When you think of materials suitable for making shoes, blood probably doesn’t come to mind. If you think it’s not possible though, you’d be wrong. To prove it, nat-2 designer Sebastian Thies and Eindhoven-based designer Shahar Livne have teamed up to create sustainable sneakers made from real blood. Your first question is likely, “Where does one source blood from to make shoes?” The answer is both weirdly easy and sustainable, as the blood comes from slaughterhouses.