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The kids actually fight over who gets to use this mug because the color shift is that fun to watch. The 15oz holds enough coffee that I'm not refilling constantly.

Pouring my morning coffee in and watching the mug shift color is honestly the best part of my day now. The 11oz size is perfect for my usual cup, and the surprise never gets old for guests either.

I've had this on my desk for a week and every single time I pour hot coffee in, I still do a double-take when the pattern shifts. The 11oz size is perfect for my morning routine, and the color change happens fast enough that guests always ask about it.