Don't worry, your coffee won't melt Frosty. Pour hot liquid into this Frosty the Snowman Frosty and the Kids Heat-Sensitive Morphing Mug and Frosty and the kids appear, ready to start their parade through town. The exterior of this 11 oz. mug transforms from black as hot liquid is added, revealing the hidden image in full vivid colors. Makes a great gift for fans of the holiday movie Frosty the Snowman. Hand wash only. Not dishwasher safe. Do not microwave.