The Adidas Ultraboost 21 Prime running shoes are for athletes giving their all. The rubber outsole with superior grip means you're ready for the elements. Boost technology ensures a responsive ride that captures your energy and gives it back. These shoes are made with Primeblue, a high-performance recycled material containing Parley Ocean Plastic and a minimum of 50% recycled material in total.Partnering with Parley, Adidas is working to prevent plastic entering our oceans by cleaning up beachesand coastal communities. Transforming waste into high performance sportswear.