Made in Japan. A dehumidifying sheet that quickly absorbs moisture and odors from the futon mattress by put it under the mattress. Since it is a type that repeatedly absorbs and releases moisture, it can be used for a long time (approximate usage: about 1 year). Also good for closets and cabinets. 1-2 sheets are standard for 1 futon mattress. Comes with a regeneration signal that lets you know the moisture absorption state at a glance (standard moisture absorption amount/about 288ml). Dry it in the sun, it can be used repeatedly and is economical. Condensation prevention, humidity control. Futon Dehumidifier Sheet Place Under Futon Mattress/Reusable After Sun Drying 98x78cm White