Cork is the bark of the Quercus Suber L., Portugal’s National Tree. It is a 100% natural plant-based tissue, shaped like a beehive of microscopic cells, filled with an air-like gas. Portugal owns a third of the global cork oak forests, being the largest producer in the world. Per year, it transforms 50% of global cork production, about 100 thousand tons. Although they already occupy 23% of the country’s forest area, important reforestation measures have been developed, generating an annual growth of around 4%.