Washington Redskins Crystal Mug. The latest, greatest, and coldest! This handsome 16 ounce mug combines state-of-the-art refreezability with color coordinated handle and base,, combined with your favorite team colors and graphics. Eliminates the need for ice as the crystal technology keeps drinks cold for hours without the watered down affect of ice! To use, place in freezer for one hour or more, where frozen crystals will turn a frosty white color. Filled with non toxic, refreezable crystals.