Hula Travel Mug. Calm Hula Thermal Tumbler - Take your cold or hot beverage with you in a double-wall thermal tumbler. This travel mug is designed to maintain the temperature of the liquid inside. It features an image of a woman performing a Hula dance. The lid is has a twist-lock feature to prevent spills. Holds about 16 oz. and measures about 7 1/2" tall. We recommend hand washing.