BOOST midsole Imported Lace closure The definition of comfort may as well be Ultraboost. This version of the adidas shoes takes the energy-returning feel they're known for and turns it up a notch. BOOST in the midsole is wrapped in Stretchweb to amplify that walking-on-a-trampoline feeling, and an adidas PRIMEKNIT upper hugs the foot. No running required. This pair is geared toward day-to-day wear. 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.