Boost cushioning deliveries incredible energy return: the more energy you give, the more you get LEP torsion system in the midsole provides less flex in the forefoot for a more responsive stride Made with recycled materials to save resources and decrease emissions 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. Primegreen These shoes are made with Primegreen, a series of high-performance recycled materials. The upper contains a minimum of 50% recycled content.