Answer: Extremely sustainable! Cork is a natural, vegan, and, above all, renewable resource obtained from the bark of the cork oak tree. During harvesting, the trees are not felled and can be harvested again approximately every 10 years, as the bark grows back. Cork is therefore a virtually endless resource that is produced in an environmentally friendly way. Furthermore, cork oak forests represent unique ecosystems and are important CO2 stores. Cultivating cork oak trees for cork production also means protecting the environment!