Place it under a futon or bed mattress to prevent mold. It can also be used in the humid rainy season and winter, when condensation is likely to occur, and for dehumidifying closets. It can be dried in the sun and used repeatedly. Dry it in the sun when the humidity control sheet sensor changes color from blue to pink. Remove the sensor sheet when washing. It was actually effective when I used it. Shipping will be done by folding it compactly.