Hand wash only. Not suitable for hot liquids. Do not microwave. We understand the convenience of dishwashers, but for our Glass Tumblers, it's a delicate matter. The frosted finish can take a hit and chip under dishwasher conditions, and we'd hate to see that happen. A NOTE ABOUT LIDS: After a good wash, let those lids air dry. When in storage, place the lid loosely on top of the glass. This allows for better air circulation and preserves the wood. The lids are made from bamboo and can soak up a lot of moisture. Trust us, no one wants a moldy surprise on their favorite glass.