Using your Dunbi - designed logo plastic tumbler is easy. First, open the lid and add your favorite drink. Then, put the lid back on and insert the straw. You can enjoy your drink mess - free. When it comes to maintenance, simply wash the tumbler, lid, and straw with mild dish soap and warm water. Make sure to dry them thoroughly before storing. A very important note: never put this tumbler in the microwave as it can damage the plastic and may cause safety issues. Also, you can get creative and customize the removable insert to make your tumbler unique.