The pavina double wall glasses keep hot drinks hot without burning fingers and cold drinks cold without messy condensation making them the ideal glasses for every beverage from cocktails to cocoa individually mouth blown by expert artisans bodumss proprietary double wall glasses feature 2 walls of borosilicate glass creating a highly effective layer of insulation 035 l 12 oz made from borosilicate glass double wall mouth blown silicone valve at base allows for changes in pressure als