Carbon Footprint | 4.81 pounds CO2e/pair (natural & recycled materials are the secret for drastically reducing emissions. Compare to avg. sneaker: 13.6kg CO2e (Cheah et al, 2013)) Upper | Vegan Corn (35% corn waste and 65% bio-based polyurethane (biodegradable) Outsole | Custom EVA insert rubber outsoles for industry-leading comfort Footbed | Removable molded in-sole Lining & Laces | 100% Bamboo