Adidas Women's Ultraboost 21 Running Shoes are designed for the hot pursuit of the pinnacle of weight, cushioning and responsiveness. They have a sock-like fit, an Adidas primeknit+ upper, textile lining, and a supportive heel counter. They also have a Boost midsole, a 10mm midsole drop, and a Stretchweb outsole with continental rubber. In addition, they are made with Primeblue fabric, a high-performance recycled material.