I was really looking forward to this purchase as it is just the perfect size to fit under the Keurig without removing the tray and holds the max amount of tea/coffee. And it's made by Keurig! What could be more perfect? Well...it's not insulated very well.  The heat comes through the surface of the mug, making it hot to the touch. And consequently my beverage does not stay hot. I was disappointed, and will stay with Contigo travel mugs.