The adidas Ultra Boost 21 Core Black is a performance running shoe from the Ultra Boost 2021 collection, featuring an upper made of PRIMEBLUE - a high-performance fabric crafted from recycled polyester sourced from Parley Ocean Plastic. This shoe includes a semi-translucent lace cage, tonal adidas mountain logo branding on the tongue patch, and an Ultra Boost-branded back heel counter. The chunkier sole unit boasts an enhanced Torsion system, comprising a White midsole and a rubber outsole with 6% more Boost capsules for a firmer stride. Released on January 28th, 2021, it was priced at $180. This lightweight shoe combines comfort with improved energy return, making it ideal for running enthusiasts.