Stars and…you guessed it: Stripes! This mug is covered in stars, that is, until you fill it with a hot beverage. As soon as you pour in a hot coffee (tea or hot chocolate will do nicely too) the mug’s appearance quickly changes. Within a minute, most of the stars will give way to the stripes…and you are left with a patriotic mug! The mug is dishwasher (not hot!) and microwave proof...however for long life it's best not to as the special coating will deteriorate sooner.