mug is made of stoneware with a stainless steel bottom to keep your beverages hot or cold and a padded base to keep from scratching surfaces. With a wax relief design on top of a beautiful rich cobalt blue color, this will stand out anywhere you bring it. Thanks to the tall and slender build, you can fit this is in your car cup holder with ease. Due to the stainless steel bottom, this drinkware is NOT dishwasher or microwave safe.