The Adidas Women’s Ultraboost 21 Running Shoes are designed to provide the perfect balance of weight, cushioning, and responsiveness. They feature a sock-like fit, an Adidas primeknit+ upper, a textile lining, a supportive heel counter, and a Boost midsole. The 10mm midsole drop provides incredible energy return, and the Stretchweb outsole with continental rubber provides superior traction. The Primeblue fabric is made from recycled materials, making it environmentally friendly.