The Bodum Pavina Double Wall Glasses are handcrafted by expert artisans out of quality borosilicate glass. This ensures that you get the most out of your drinking experience. The double wall design of the glass adds depth and functionality to your glasses. They are made of quality, mouth-blown borosilicate glass and are dishwasher, microwave and oven safe (up to 176degC). The Bodum Pavina 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 you’ll only need to buy one type of glass for your home! The borosilicate glass used in these glasses is one of the strongest compositions of glass available. The particles in borosilicate glass are held closer together than traditional glass, making it sturdier and better able to adapt to temperature swings. This makes borosilicate glass perfect for holding extremely hot and cold temperatures without expanding or cracking. You can rest easy knowing borosilicate is the same glass type that laboratory beakers are made of.