These novelty glasses are made from heat resistant and mouth-blown glass. These are made from borosilicate glass which is stronger than common glass. These are shatter-resistant and provide plenty of insulation with their double-walled design.
Keep your hands cool even with your hottest drinks, and be free of unsightly condensation with your cold beverages. These are also completely dishwasher, microwave and freezer safe. Comes with 1-year warranty.