Sheet contains silica gel and anti-mites and deodorizers all over. Place under the sheet under the bed pad to prevent dust mites and absorb night sweat so you can stay dry forever. Recyclable silica gel will restore the moisture absorption effect after occasional drying in the sun. Only inorganic (mineral) materials are used in the sheets. Often chemical resistant sheets are anti-mite sheets, but the sheets that volatile and kill chemicals are not good for the body. Inorganic minerals absorb and dry mites and kills them so they do not harm your body and skin, and they can be safely used by people with conditions such as atopia and hypersensitivity. [Materials/ Standards] Recycled silica gel, anti-dust mites bonarex [How to use] Place it under sheets and bed pads. Recommended for areas that tend to mold (moisture buildup) such as between the mattress and the futon, under the mattress. Features: As an estimate, dry it in the sun once 3 days in the sun and regenerate it to absorb over 20.3 fl oz (600 ml) of night sweat. Bonalex and silica gel are resistant to dust mites, mildew, and deodorizing [Replacement Standard] About 1 to 1.3 years (If you turn to yellow, it will absorb proteins etc. and become clogged in and so please replace it.)