The Hattifatteners resemble thin mushrooms. Their large, unfocused eyes change colour according to their surroundings. During thunderstorms, the Hattifatteners become highly charged with electricity and it’s a good idea to avoid them. You can sense their presence as an electrical charge in the air. At other times they’re harmless. When buying Moomin designs you buy more than just a mug. You buy a thought and a positive attitude towards life.