Your former PR doesn't stand a chance the moment that you lace up the Adidas Women's Ultraboost X Running Shoe. Delivering unprecedented energy return, the Ultraboost features Adidas' boost midsole material, which enhances the swiftness of your transitions, attenuates shock, and bolsters your comfort underfoot. The shoe also features a floating arch that molds to the contours of your foot, while the Primeknit upper hugs, adapts, and flexes with your stride, preventing hot spots and chafing that sometimes occurs with ill-fitting shoes. Additionally, the Continental Rubber outsole maintains subtle, yet substantial traction when you need it most, which will come in handy considering you're kicking up dust faster than oxygen feeds a flame.