Hidden behind the sea otters adorable appearance and playful behavior is a fiery temperament. Otters are arguably the most gifted natural urchin divers in the world of marine mammals. Wear your favorite furry creature with the Mad Otter t-shirt Illustrated by founder Mike Golder. The Mad Otter Hat captures one of the oceans most beloved characters. Our men's hooded sweatshirt is made with soft, heavyweight fleece and generous fit for comfort. Features jersey lined hood, heavy gauge drawcord with metal eyelets, ribbing at cuffs and waistband.