Unopened, unused. ◆ This dehumidifying mat, with silica gel, powerfully absorbs unwanted moisture. It can be used by simply placing it under your current futon or mattress. ◆ Size: 150 x 180cm ◆ Absorbs sweat, moisture, and odors for a fresh and comfortable feel. It prevents mold growth and deters dust mites, ensuring a pleasant night's sleep. ◆ Suitable for use on both beds and floors. For bed mattresses, place the dehumidifying mat on top of the mattress and then add a bed pad. For futons, place the mat directly on the floor and then put the futon on top. ◆ Can be reused by drying. It comes with a moisture sensor that changes color to indicate when it needs to be dried. When the sensor changes color, dry it in the sun or with a futon dryer. ◆ Surface fabric: 100% polyester, Back fabric: 100% polyester, Filling: Type B silica gel, with moisture sensor.