78201 Oboz Men's Cottonwood Low B-DRY The Cottonwoods are Oboz's most sustainable hiking shoes to date. Each hiking shoe features numerous 100% recycled elements including the upper and lining, along with a bio-based "I'm Green" Sugarcane EVA midsole, and a PFAS-Free DWR (durable water repellent) finish. That should provide some bonus smiles with every mile.