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Poured my coffee at 7am and it was still properly hot at lunch, which never happens with my old mug. The insulation really does what it claims.

I dropped this tumbler in my bag on the way to work and forgot about it, and my coffee was still genuinely warm when I got to my desk hours later. The insulation really does what it claims.

My coffee stayed hot for nearly four hours on a freezing commute, thanks to the premium insulation. The tumbler also fits perfectly in my car's cup holder, which is a big plus.