Buy Adidas UltraBoost 21 。Adidas Ultraboost 21 Athletic Triple Black Running Shoes FY0306 Men\'s Sizes NWT New Without Box ENERGY WAS JUST ENERGY UNTIL ENERGY MET ULTRABOOST 21. Prototype after prototype. Innovation after innovation. Testing after testing. Meet us in the hot pursuit of the pinnacle harmonization of weight, cushioning, and responsiveness. Ultraboost 21. Say hello to incredible energy return. If you\'re looking for a running shoe that provides superior cushioning and a responsive ride, then the adidas UltraBoost 21 \'Triple Black\' is the perfect choice for you. This stealthy black shoe features a flexible Primeknit upper made from recycled materials, including Parley Ocean Plastic. The Boost midsole provides 6% more Boost capsules for increased energy return, while the Linear Energy Push technology offers 15% more forefoot stiffness. Lace closure Textile upper Boost midsole Rubber outsole Box2:5