Using this tumbler is a breeze. Just open the lid, pour in your favorite drink - be it a hot coffee or a cold smoothie. It's great for taking with you on hikes, to the office, or just around town. Remember, when you're using it with hot water, don't be alarmed if the steam makes the lid lift a bit. It's nothing to worry about. To keep your tumbler in top shape, wash it with mild soap and warm water after each use. Avoid using abrasive cleaners as they might scratch the surface. Let it dry thoroughly before closing the lid to prevent any mold growth.