AfterPay Available - The next generation in the UltraBoost series has landed. Delivering a fresh take to your classic training silhouette, the Adidas Ultraboost 21 embodies performance technologies to drive your game to the next level. Featuring 6% more Boost capsules than its predecessor, for optimal comfort, and prime responsiveness. Adidas have raised the bar and met demands of the modern runner by implementing an innovative, Linear Energy Push system. This design provides flexible forefoot and midfoot support, to generate more propulsion with each stride, making you unstoppable.