The over-engineered YETI Rambler Tumbler is made with kitchen-grade 18/8 stainless steel and double-wall vacuum insulation. The end result? A tough, hard-wearing personal drink cooler that keeps ice twice as long as plastic tumblers -- it works just as well for hot beverages! The lid is easy to clean, shatterproof and clear so you can see the contents. Dishwasher safe.