Women's Ultraboost shoes for a responsive ride Sock-like fit; adidas Primeknit textile upper for a locked-in feel and a midfoot cage for support The incredible energy return of adidas Boost is created by fusing together energy capsules, giving you the power to keep your feet moving Stretchweb outsole flexes naturally for an energized ride; Continental Rubber gives you superior traction This product is made with Primeblue, a high-performance recycled material made in part with Parley Ocean Plastic. 50% of the upper is textile, 75% of the textile is Primeblue yarn. No virgin polyester.