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I was skeptical it'd actually hold temperature, but my coffee stayed piping hot through a full two-hour meeting without a single sip going lukewarm. It clicks onto the tumbler securely and doesn’t add any bulk to my bag. Honestly, this is the kind of accessory I didn’t know I needed until I had it.

This little thing’s saved my desk setup — the fit on my tumbler is snug enough that I don't worry about spills when I shove it in my bag between meetings. It does exactly what the listing says, keeping drinks at temp so I’m not sipping lukewarm coffee by noon.

Keeps my coffee hot for hours on my commute, and the lid clicks on tight enough that I don’t worry about spills in my tote. Even after a full morning of meetings, it’s still warm enough to enjoy.