You just put this mug in the freezer if you want it extra cold and it keeps you drink cooler than with ice alone. And you can use this without it being frozen.The latest, greatest and coldest! It's easy to enjoy a thirst quenching frosty beverage with this mug! This handsome 16 ounce mug combines state of the art refreezability with a color coordinated handle and base. Features eye catching crystals between the outer and inner layer.