Tervis Tumblers are manufactured and assembled in the USA. Each tumbler is carefully hand-assembled to meet our high-quality standards. Double-walled insulation does more than just reduce condensation and rings. It also helps keep your hot drinks hot and your cold drinks cold for a longer time! In fact, hot drinks can stay hot up to 3 hours even without a lid. Hot drinks with a lid can last as long as 6 hours! Tervis Tumblers aren't just for beverages either. Heat up some soup in your 17oz mug, have a scoop of ice cream in your 12 oz. Go ahead, we approve!