Welcome to the Adidas Womens Ultraboost 21 Running Shoes! These shoes are designed for the perfect balance of weight, cushioning, and responsiveness, resulting in an incredible energy return. They feature a sock-like fit, an Adidas Primeknit+ upper, a textile lining, a supportive heel counter, a Boost midsole, a Stretchweb outsole with Continental rubber, Primeblue fabric, and a lace closure. The new Torsion System provides a 15% increase in forefoot bending stiffness for a more responsive run.