What is a double wall glass mug?

For the uninitiated, double-walled glass mugs are clear-looking, unique in shape and always with creative design. What you might not expect is that they’re significantly thicker than a simple glass mug (almost always with air in between) and fix a big problem we have with both glass mugs, and normal ceramic ones, that they get hot (when holding coffee or tea). Sometimes (too often) uncomfortable to hold because the hot moves so seamlessly from the outside to the handle area. Double glass walls fixes that problem. Super well. Double wall glasses look great, feel great, and never sweat (when holding cold beverages) nor make your hand uncomfortably hot...

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