Rubber sole BOOST midsole Continental Better Rubber outsole Whether it's a leafy neighborhood, a creekside trail or the wooded track at the edge of town, nature provides beauty and solace for some of your best runs. Take a step toward preserving it with these running shoes that are made with natural and renewable resources. They offer all the best features of the iconic Ultraboost, including responsive BOOST cushioning and foot-hugging adidas PRIMEKNIT. So they feel good while doing good.