The adidas Ultra Boost 21 Pulse Aqua Black is designed to pop with color, enhance your running performance, and reduce plastic waste in production. The Pulse Aqua Black adidas Ultra Boost 21 features an upper constructed of black Primeknit and Primeblue, a flexible fabric using 100% recycled polyester and recycled Parley Ocean Plastic. Blue synthetic forms a sturdy heel counter with red Ultra Boost branding, and translucent white synthetics are used to form the iconic adidas side-panel three stripes that integrate into the eye stays. Red adidas branding on the tongue, purple laces, and yellow edging around the collar and heel complete the vibrant look of this upper. The black midsole is constructed of Ultra Boost for a soft landing and propulsive energy return with every step, and it incorporates a Torsion System to increase forefoot flexibility. Our favorite aspect of this many-hued shoe is its most colorful part: the dynamic outsole. Lugged black rubber circles the outer foot, surrounding a loop of purple rubber, undulating red rubber strips, and a forefoot rubber pod in bright yellow. The adidas Ultra Boost 21 Pulse Aqua Black was released on June 17, 2021, for $180 retail.