Using this tumbler is easy. Just open the lid and pour in your favorite drink, whether it's hot coffee or cold juice. When you're ready to take a sip, close the lid securely. Remember, if you fill it with hot water, the steam might lift the lid, so handle it carefully. To keep your tumbler in top condition, wash it with mild soap and warm water regularly. Don't use abrasive cleaners as they can scratch the surface. And when not in use, store it in a dry place.