Hearth Glass Mug

The double-walled design creates a thermal barrier that significantly slows heat loss compared to standard ceramic mugs. While it won't keep coffee piping hot for hours like a vacuum-sealed travel tumbler, it will keep your beverage at an enjoyable drinking temperature for a longer period.

We strongly recommend hand washing these mugs. While the borosilicate glass is durable, the delicate structure and the sealed air gap between the walls can be compromised by the high heat and pressure of a dishwasher cycle.

Yes, they are microwave safe. You can safely reheat your coffee or tea directly in the mug without worrying about the glass cracking.

Each mug has a capacity of 6 ounces. This makes them perfectly sized for a standard espresso, a double shot, or a small, concentrated pour-over coffee.

Yes. Because of the double-walled construction, the outer layer of glass remains cool to the touch, allowing you to hold the mug comfortably without needing a handle.