The adidas Ultra Boost 2021 OG Core Black keeps things classic as it comes dressed in a Core Black and Grey Four color scheme. This new Ultra Boost model differentiates itself by coming constructed out of 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. The Black upper is paired up with a semi-translucent lace cage, Black heel counter, White Boost midsole and stretchweb outsole with Continental rubber.