This is a waterproof sheet that came with a Nitori futon set. The size is 70x120cm, and it has rubber bands on the four corners of the back to prevent slipping. I used it under the fitted sheet, but I only used it in the living room during the day, I used it in rotation with other items, so the frequency of use was low. I used it for about 1-2 months. There are some areas on the surface with slight pilling, and it shows signs of use. Please refrain from purchasing if you are concerned. I will fold it compactly for shipping.