Enjoy a hot beverage with the serene insulated double-walled glasses. These glasses are crafted with heat-resistant borosilicate glass, so the contents remain hot while the cup stays cool to the touch. The perfect gift idea for any occasions. These 13.5 capacity double wall mugs are perfectly suited for hot or cold beverages. Made of borosilicate glasses, they are designed to keep your liquid hot or cold for longer, while keeping your hands cool. These coffee mugs are also dishwasher, microwave, and freezer safe.