adidas Women's Ultraboost 21 Running Shoe Size 11 Rubber sole Women's running shoes built for a smooth and energized ride Sock-like fit hugs the foot; Lace closure provides secure fit Stretchweb outsole flexes naturally for an energized ride; Continental Rubber gives you superior traction; Textile lining for comfort; S-curve heel shape adds support; Boost midsole for cushioning 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.