Highwave Hotjo Travel Coffee Mug 18oz. We hope that you find at least something new and informative thermal cups bottom wide here. YETI amazon. It also feels sturdy and looks great. Once clean, put either thermal cups bottom wide or cold water in it for a few minutes to prep it for your drink — cold water if you will be adding a cold drink; hot water if you will be adding a hot drink pour this water out right before filling it with your preferred beverage.