adidas released the Ultra Boost 4.0 ‘Maroon’ in February 2018. The Three Stripes’ flagship runner is outfitted in a Primeknit upper that offers both seamless comfort and an eye-catching appearance, thanks to a contrasting blend of red and maroon yarns. A similar two-tone aesthetic is seen on the laces, while the molded midfoot cage and heel counter are rendered in solid maroon and burgundy finishes. The white Boost midsole and black Continental Rubber outsole adhere to the traditional design playbook of the Ultra Boost line.