"Natural cork" refers to a type of material that is derived from the bark of cork oak trees. It is used to make stoppers for wine bottles or as a flooring material. Full definition
Research has shown that wine drinkers assume that wines with natural cork stoppers are better. (treehugger.com)
While the percentage of natural cork closures compromised by TCA (2, 4, 6 - Trichloroanisole) has declined dramatically within the last decade, TCA continues to impact a very small percentage of global cork production. (wineindustryadvisor.com)
And choosing wine sealed with natural cork closures helps to preserve the Mediterranean cork forests. (drvino.com)