For those with a love of scuba diving, this Morphing Mugs heat-sensitive mug is for you. Recapture the beauty of the underwater world every time you sit down with a hot cup of coffee. The exterior of this 11oz mug transforms from black as hot liquid is added, revealing the image in full vivid colors.While this mug may be used in the dishwasher or microwave, for the longest lasting, highest quality product, we strongly recommend against it.