At the pinnacle of sport-proven performance and stylish design stands the Ultraboost X. Designed using motion capture technology for an improved fit, these womens neutral running shoes are built to flex with your foots natural movement. A sock-like adidas Primeknit upper wraps around your foot and conforms to every footstrike, while an adaptive arch and dual-density heel counter offer targeted support for a stable stride. The Boost midsole powers every step with energy-returning cushioning.