Durable, double-wall stainless steel vacuum construction with copper insulation, which allows your beverage to stay cold for 24 hours and at least 8 hours for hot beverages. The construction also prevents condensation on the outside of the tumbler. Push-on two piece lid with Tritan™ swivel anti-spill closure, pinch the 2 axis joints slightly to remove the top part of the lid for easy cleaning. Wide opening for comfortable filling and pouring. Design features the spinning, geometric bottom.