U.S. winemakers have something to celebrate, the corks they're popping aren't subject to tariffs.

Cork comes from the spongy bark of the cork oak tree, which is primarily grown and harvested in the Mediterranean basin. The framework trade agreement between the United States and the European Union singled out the material as an “unavailable natural product.” So as of September 1, cork joined a handful of other items, including aeroplanes and generic pharmaceuticals, that are exempt from a 15% U.S. tariff on most EU products.