The insulating quality of the double wall glasses doesn&rsquot just keep hot drinks hot for a longer period of time, it also keeps cold drinks cold longer. Another nice thing about them &ndash there is no condensation water when you serve cold drinks, therefore no messy rings on your table. And by the way, they&rsquore great for ice cream as well. Double wall glasses are truly multifunctional. They are made from borosilicate glass and are dishwasher safe