Natural cork, rubber sole Made by hand in Portugal MATERIAL Cork is harvested by stripping the outer bark of the cork oak tree, which then re-grows over the next nine years. No trees are harmed in the process. At the end of the product life cycle, this material is 100% eco-friendly. It is soft to the touch, water resistant, and offers almost limitless design options. Cork footwear is the benchmark in eco-friendly, leather-free footwear. The bark of the cork oak tree is transformed into a soft and supple material. Cork can be cleaned with soap and water, it needs no special treatment. The cork shoes will stretch a little after long-term wear. Interiors are all natural materials and most of the interiors are biodegradable. The exterior sole is rubber.