Cork is a layer of bark of cork oak or cork tree, growing mainly in southwestern Europe and northwestern Africa. When mining cork, the cork tree is not cut down, the bark is simply removed from the tree. The bark begins to be removed when the tree reaches the age of 25 years. This is done every 9 years. The trees live for about 300 years.

The cork has unique properties. It is light, impermeable, wear-resistant, non-allergenic, resilient material, capable of withstanding large loads on its surface, and then again returning the old form. The cork is used mainly in the manufacture of summer shoes. Such shoes can be worn both in the heat and in the rain, the cork material is very practical. Granules of cork can also be mixed into rubber to give the sole more flexibility.