Signature Tumblers use double-walled technology to greatly reduce the amount of condensation. No need for a coaster! Our double-walled technology allows your beverage to maintain it's temperature longer, helping hot drinks stay hot and cold drinks stay cold! Signature Tumblers are virtually indestructible and guaranteed for life. They won't crack or shatter! Our tumblers are safe anywhere in the kitchen. Conveniently clean them using the dishwasher, or quickly reheat in the microwave (Note: Tumblers with Bling embellishment are NOT MICROWAVE SAFE). Two-position closure lid with spot for straw included with this tumbler mug. Lid can be disassembled for cleaning.