Using this tumbler is easy. Just open the lid, pour in your favorite drink, and close the lid. It's great for both hot and cold beverages. When filling with hot water, be aware that the steam may cause the lid to lift a bit. This is normal, so don't worry. To maintain it, simply wash it with mild soap and water. Avoid using abrasive cleaners that could scratch the surface. Keep it in a dry place when not in use, and it'll serve you well for a long time.