A wine aerator decanter is a device that is used to aerate wine as it is poured. It is also used to improve the flavor of the wine. The aerator allows the wine to come in contact with air, which releases the wine's aromas and enhances the flavor. The aerator also cools the wine, which allows it to be consumed at a more desirable temperature. The wine aerator decanter is made of glass and has a long neck with a rubber stopper on the end. The rubber stopper prevents the wine from coming in contact with the air inside the decanter, which would release some of the wine's aroma.