The adidas Ultra Boost 21 Core Black features a black colorway with white accents on the sole. Made with adidas Primeblue material, which consists of recycled materials collected from the oceans, the black mesh uppers provide breathability, while the mudguard is more solidly constructed. The tongue has a mesh finish and showcases a dark grey emblem with three embossed stripes and the 'adidas' brand name. A TPU panel in a grey tint outlines the signature three stripes on the side walls. The heel stabilizers include plastic fortification with 'ULTRABOOST' branding. The technology-laden sole boasts a white textured midsole with Boost capsules for superior energy return, and a forefoot outsole that incorporates a Torsion System for added comfort. This model was released on January 28th, 2021, priced at $180.