The adidas Ultraboost Light shoes have a flexible and supportive build to take on the most demanding runs. They're made with BOOST Light, our lightest BOOST ever more than 10% lighter with even more energy return and cushioning. The foot-hugging adidas PRIMEKNIT upper is forged for incredible support. This shoe's upper is made with a high-performance yarn which contains at least 50% Parley Ocean Plastic reimagined plastic waste, intercepted on remote islands, beaches, coastal communities and shorelines, preventing it from polluting our ocean. The other 50% of the yarn is recycled polyester.