The "Vriesglass" is a beer glass that's specially designed to cool down warm beer. You store the glass in the freezer to keep the "special fluid" within its hollow sides frozen.

After an hour in the freezer, the glass is ready to bring beer at room temperature down to between freezing and two degrees C within five minutes.The glass will continue to chill for half an hour and has an elliptical line molded on it for pouring to "automatically create the ideal tap or pouring angle".

Source: heineken.nlAdded: 15 September 2011