I bought this for my husband because he cant start a day without coffee, if he is in the office he gets really busy so half way drinking the cup gets cold and he dont even have time rewarming it, so he just drink it cold which is yuck or he dont touch it anymore. When he is at home he makes coffee and gets busy cutting grass or doing some honey do’s and coffee gets cold again and he normally just make a new one (such a waste of coffee). By sharing all that, this ionmug makes sure my husband has perfect temperature for his coffee and the style is very classy looking also! He said he really loves this ionmug, this is one of his favorite item on his desk!