The adidas Ultra Boost 2021 Solar Yellow dons a Solar Yellow, Cloud White, and Screaming Pink color scheme. Signature to the Ultra Boost 2021, the running sneaker comes 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 Solar Yellow upper is joined by a clear lace cage and heel counter, while being contrasted by a White Boost midsole and stretchweb outsole with Continental rubber.