The Double Wall Glasses keep hot drinks hot without burning fingers and cold drinks cold without messy condensation, making them the ideal vessels for every beverage, from cocktails to cocoa.So youll only need to buy one type of glass for your home!Features:Individually mouth-blown by expert artisans, BODUMs proprietary Double Wall Glasses feature two walls of borosilicate glass, creating a highly effective layer of insulationIntelligent silicone valve that equalizes the air pressure between the two layers of glassAlso perfect for serving ice cream and soupsDishwasher, microwave safe, and oven safe. (up to 350F/176C)Innovative double wall construction that keeps hot drinks hot and cold drinks coldIdeal for every type of beverage from cocktails to cocoa