You can slip them on and off in seconds, thanks to a speed-lacing system. And you can cruise confidently through city streets with mud guards that help repel grit. Of course, it wouldn't be an NMD without technologies from the running world. BOOST cushioning and a stretchy knit upper wrap your feet in comfort. This shoe's upper is made with a high-performance yarn which contains at least 50% Parley Ocean Plastic - reimagined plastic waste, intercepted on remote islands, beaches, coastal communities and shorelines, preventing it from polluting our ocean. The other 50% of the yarn is recycled polyester.