Insulated Glasses, Tumblers and Thermal Containers
Plastic and metal insulated cups, tumblers and containers are great for keeping hot things hot and cold things cold. Most are constructed with two layers of material with an airspace between the two. It's that airspace that provides the insulation.
While some containers are labeled as dishwasher safe, many are not. It is best to hand wash both plastic and metal insulated containers. If you decide to place one in the dishwasher, opt for the top rack and skip the high heat of the drying cycle.
Comments: I'm waiting on the list of what I CAN put in my dishwasher!