Using this tumbler is easy. First, remove the lid and insert your custom insert if you have one. Then, fill it with your favorite drink. Put the lid back on and use the straw to enjoy your beverage. When it comes to maintenance, you can wash it with mild soap and water. Avoid using abrasive cleaners. And always keep in mind that this tumbler is not suitable for the microwave. It's designed for a mess - free and enjoyable drinking experience at various events.