Close-up of a pink, stainless steel insulated tumbler with a silver lid. Insulated tumblers, like this one, are designed to keep beverages at a desired temperature for extended periods. They often feature double-walled construction with a vacuum-sealed space between the walls to provide insulation. This design helps keep cold drinks cold and hot drinks hot for hours. Insulated bottles are often made from materials like stainless steel and are considered a good alternative to single-use plastic bottles.