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Title: They forgot to insulate the lid!
Review: Although the sides are well-insulated with vacuum/mirror technology, that doesn't help much when the lid is plain plastic...and not very thick at that. (It's like having the best quality insulation in the walls of your home, but leaving the front door wide open!) This fault is clearly evident by just feeling the exterior of the tumbler when it is filled with hot liquid (coffee): the sides are cool to the touch, but the top third of the tumbler gets hot. I returned mine because of this design flaw. On the positive side: it is an attractive tumbler, its size is perfect for auto travel, and I liked the feature to open a convenient drinking port with a lever. However, my nose hit the lid with every sip. Thermos/Nissan needs to realize there is a HUGE market for a decent vacuum tumbler, and stop cutting corners. Do some market research, guys!
