The Saucony Triumph RFG is cushioned, comfortable and eco-conscious. One of the best sustainable running shoes, the Triumph RFG takes everything we love about the Saucony Triumph 21, but uses eco-friendly materials and processes to help reduce your impact on our planet. Get outside more and feel good doing it with the Saucony Triumph RFG. Features Upper: The upper is made from cotton using plant-based dyes. Midsole: Saucony’s new PWRRUN BIO+ cushioning is soft and responsive. 55% of the foam is made from corn, a renewable resource that lessens the dependence on plastic. Outsole: The gum rubber outsole is made from 80% natural rubber.