Cue an insulated coffee mug. We got our hands on a wide array of ... stay hot for 12 hours or cold for 24, and the interior glass finish ensures your beverage doesn’t take on a metallic taste.

The Vinglacé, on the other hand, is an insulated glass coffee mug, making it non-reactive and allowing you to hone in on your brew's exact tastes and smells. Jennifer Zyman, our Testing Editor ...