Enjoy your wine at that perfect temperature even after being served on these Chill Maintaining Wine Glasses. They can keep wine chilled between 32° F and 36° F for 30 minutes. This is due to the vicous cooling liquid present between the two layers of the double walled glasses. The liquid freezes after one hour in the freezer which then in turn helps in keeping the drinks chilled for a longer span of time. The glasses have been made out of durable borosilicate which can easily withstand extreme temperature between -22° F to 482° F. Every glass will hold 4 3/4 ounce with the slender shape helping in keeping the wine aroma intact. A must-have for making those wine parties stretch for longer hours.