Remove the lid when heating in a microwave. Do not overheat in a microwave or heat without water. Do not heat oily or sugary foods for a long time in this product. Do not place near open flames. Keep out of reach of children. Immediately wash and dry well after use, and keep dry when not in use. Wash with care. Do not use abrasive cleansers or steel wool. When using a dishwasher, please store them in the upper basket to avoid force and weight applied to them. Do not put this product in boiling water as it may cause deformation. Do not drop or subject the product to strong impact as it may cause breakage or leakage. Do not put the product in a freezer as it may cause warp or breakage. Make sure the food is cooled down enough before closing the lid to avoid deformation of the lid and food spoilage. Be careful not to pour too much food as it may overflow when closing. Attach the silicone ring to the lid. Close the lid tightly to prevent spills or leakage when carrying. Keep it horizontally as the container is not completely sealed. Do not put liquids such as soup in this product as it may leak out. Do not hold by the lid as the tumbler may fall and break. Do not leave the beverage inside the product for long time as it may spoil. Do not leave the product under high temperature such as in a car. Please note that using the product with citrus fruit juices may cause the product to deteriorate due to terpene contained in the fruit's skin. Keeping food with strong odor or color in this product for a long time may cause transfer of the the smell or the color. Some products may have roughness on the surface due to the polishing process to remove sharp parts. Some products may have thin lines on the surface due to plastic manufacturing process.