PUREBOOST 21 SHOES RESPONSIVE RUNNING SHOES DESIGNED FOR NATURAL MOVEMENT. A training plan is only as good as the effort you put into its execution. These adidas running shoes support your dedication with the incredible energy-return of Boost. The upper is made with recycled materials, so your run will feel great in more ways than one. This product is made with Primegreen, a series of high-performance recycled materials. 50% of the upper is recycled content. No virgin polyester.