Your run isn't just a run. It's a chance to commit to being your best. These adidas Ultraboost 21 running shoes? They're built on the same idea. Every version we drop builds on the last to raise the bar in comfort and energy return. Their adidas Primeknit+ upper adapts to the changing shape of your foot, Boost cushioning energises your stride and adidas LEP gives you a little extra push with each step. This product is made with Primeblue, a high-performance recycled material made in part with Parley Ocean Plastic. 50% of the upper is textile, 75% of the textile is Primeblue yarn. No virgin polyester.