New in Box. ADIDAS Ultraboost 21 W, Women's Running Shoes. FY0402Say hello to the new wave with the adidas Ultraboost 21 running shoes. Under the HI ENERGY trademark, these top-of-the-line sneakers from the 3-stripes brand will amaze you with several design adjustments that do the impossible: optimizing their performance even further for an increasingly fluid and faster experience.With a 6% density increase, the boost™ midsole comes loaded with explosive and comfortable cushioning that will delight neutral runners looking for more speed and smoothness on the road. Energy return also sees an important upgrade thanks to the new LEP Torsion System, which increases momentum with every stride due to an additional 15% stiffness and flexibility. As usual, the Stretchweb outsole with Continental™ rubber compound provides phenomenal traction on asphalt in all weather conditions.The quintessential German sportswear brand continues its commitment to the environment with its innovative Primeknit upper, using Primeblue recycled polyester fabric to give you optimal softness, breathability, and support throughout your run. A molded heel counter enhances stability and reduces overload on the Achilles tendon for a smooth, seamless run.Sizes Available: US Women's 8 and 9(252)