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Review title: Pretty, great insulation, seems to always look a little dirty.
Product review: The double walled insulation keeps the outer wall comfortable to hold, but it still gets warm enough feel cozy on a cold night. Mostly I put tea in these, but for some reason I have trouble keeping these clean looking. Maybe its the all glass, see-through nature of it, but I can alway see water spots or lines or some such on them. Doesn't make me squeamish but I could see how that might bother others.
