These adidas Ultraboost running shoes combine the most advanced adidas technology for a performance that has to be felt to be believed. The sock-like adidas Primeknit upper has been redesigned to allow air to flow freely. A supportive heel counter supports the back of your foot, while adidas BOOST delivers maximum comfort and energy return. The Stretchweb outsole is made with Continental Rubber for a firm grip and a smooth ride. 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.