Our double-walled technology allows your beverage to maintain itÆs temperature longer, helping hot drinks stay hot and cold drinks stay cold! Signature Tumblers are virtually indestructible. They wonÆt crack or shatter! Our tumblers are safe anywhere in the kitchen. Conveniently clean them using the dishwasher, or quickly reheat in the microwave.Our tumblers are proudly made in the USA! Signature Tumblers use double-walled technology to greatly reduce the amount of condensation. No need for a coaster! Lids are sold separately.