Place in freezer one hour or more prior to use, when frozen crystals will turn a frosty white color * 16-Ounce mug combines state of the art refreezability with team colors and graphics * Filled with non toxic, refreezable crystals * Eliminates the need for ice as the technology keeps drinks "crushed ice" cold for hours without the watered down affect of ice * Not recommended for Dishwasher or Microwave