Waterproof sheet. I bought this because my grandchild was coming to visit, but I only used it once. I washed and stored it. Waterproof sheet: Approximately 100 x 135 cm, yellow Purchased at Nishimatsuya. Please excuse any errors as these are amateur measurements. There were no accidents. Please note that this is a sheet without elastic. Please consider purchasing if you understand that this is a home-stored, used item. Please refrain from purchasing if you are concerned about minor details. To prevent any trouble, please ask any questions you may have in the comments before purchasing.