Using this tumbler is easy. Just take off the lid, fill it with your favorite drink, put the lid back on, and insert the straw. It's perfect for any kind of beverage. When it comes to maintenance, you can wash it with mild soap and water. Make sure to dry it thoroughly before using it again. Always remember not to put it in the microwave, as it can damage the tumbler and may be dangerous. The customizable insert can be removed and cleaned separately if needed. Enjoy your drinks with this stylish and practical tumbler!