Abstract: A container for hot liquids includes a thermal barrier printed on a surface thereof. The thermal barrier includes a plurality of expandable microspheres that expand when exposed to heat to increase thermal insulation. During shipping and pre-use, the thermal barrier is not activated. Exposure to heat from a hot liquid poured in the container activates the microspheres, which expand to increase thermal insulation properties, thereby allowing a user to hold the cup without being too hot to the touch.