Rubber sole Continental Rubber outsole Imported Lace closure Experience a smooth run with the Ultra 4DFWD running shoes. They combine the upper of our iconic Ultraboost with a 3D-printed adidas 4DFWD midsole that's innovated to compress forward, reducing braking forces and transforming the impact energy into forward motion. The result provides a smooth transition and unique gliding experience. An adidas PRIMEKNIT upper hugs the foot with targeted areas of support, while the Continental Rubber outsole provides extra grip in all weather conditions. 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.