This is a dehumidifying sheet from Magniflex. Size: Semi-double Approximately 115cm x approximately 190cm Features: Moisture absorption I received this as a gift, but I haven't used it because the size of my futon changed, and it has been stored unused. The bag has been opened, but it is new and unused. *Please note that to save on shipping costs, I will open the packaging and fold it as compactly as possible for shipping. I opened the bag, but I put it back in immediately without using it. Please purchase only if you understand this. An essential item to protect your bedding from sweat and moisture. The Mani-Sheet Dry is excellent for dehumidifying, deodorizing, and antibacterial effects, protecting your bedding from sweat and moisture. This is the latest model with even better moisture release and absorption than the previous Mani-Sheet. Maintenance is also easy. Just sun-dry it, and the moisture absorption/release and deodorizing power will be restored. Material: Surface: Synthetic fiber (acrylate-based) 40%, Polyester 60% Back: Polyester 100% Hem: Polyester 100% Washing: When washing, always roll the felt side (surface) inward and wash in a net.