The worst feeling in the world is when you are ready for another sip of your ice cold (or steaming hot) drink and its luke warm! That’s why we developed our thermal DCupz with kitchen-grade stainless steel and used double-wall vacuum insulation. And we’ve effectively come up with a drink insulator that will maintain ice twice as long as other tumblers — and it works for hot beverages too. The tightly sealed lid keeps your beverage in its place. The tumbler and it’s lid is dishwasher safe and shatter resistant.