Sleek, light and packed with performance tech, these adidas Ultraboosts score high across the board. While the sock-like adidas PRIMEKNIT upper feels airy and flexible, a specially-designed heel counter supports the backs of your feet to keep you striding comfortably through long runs. The energy-returning adidas BOOST midsole is cushioned and springy, while a Stretchweb outsole, made with Continental Rubber, grips any surface for 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.