The adidas Ultraboost 21 Cold RDY is ideal for winter running. It has a water-repellent insulated upper, a comfortable sock-like fit and an energizing Boost midsole for longer miles. The WinterGrip outsole provides reliable traction on slippery surfaces. The textile upper contains Primeblue fibers, reducing the need for new polyester. Ideal for urban movements with maximum stability and dry feet.