Flexible tech materials and SuperLight Foam cushioning offer performance comfort in a modern training shoe. Lace-up style Textile upper and lining/synthetic sole Imported The SweetFoam™ midsole is made with sugarcane-based EVA, a carbon-negative alternative to EVA foam derived from petroleum. The sugarcane is sourced from southern Brazil, where it relies on rainwater, not irrigation. It’s sourced according to rigorous standards jointly developed by Proforest and Braskem, and the farms are audited by a third party. AllBirds is allowing its Carbon Footprint tools to be open source rather than proprietary, so it can make a difference in the shoe industry as a whole