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Filled it with hot coffee at 6am and it was still steaming at lunch. The tumbler feels solid without being heavy, and it hasn't leaked once in my bag.

This tumbler actually keeps my coffee hot for hours—I was skeptical but it really works. The insulation is better than any other I've tried, and it fits perfectly in my car cup holder. Great for my morning commute.

The insulation really does the job — my coffee was still warm three hours into my shift. Only gripe is the lid takes a bit of force to click shut, so I've had a couple of near-spills.