BOOST midsole Fitcounter heel counter We cater for all, from elite professional athletes and teams to any individual who wants to make sport part of their lives Regular fit Sleek, light and packed with performance tech, these adidas Ultraboost shoes 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.