Got this in the family Christmas grab bag. It works pretty well! I’ve been sitting with a cup (thin bone china) of hot tea in a cold (67F) room for about 2 hours now and the tea is still hot. Not as hot as when originally brought downstairs of course, but hot enough to call it more than warm. :) Short of a cup cozy plus a lid, this is a good and inexpensive alternative.
Plus, it is sunny!
