To use these tumblers, simply remove the lid, add your favorite drink, and replace the lid. Then, insert the straw and start sipping. When customizing, you can easily place your personalized insert into the double - wall storage space. For cleaning, use mild dish soap and warm water. Rinse thoroughly and let it air dry. Always remember not to put these tumblers in the microwave as it can damage the plastic. With proper care, these tumblers will last you a long time and keep enhancing your drinking moments.