Purchased from Rakuten: A single-size waterproof box sheet. Brand new and compressed. Color: Beige Size: 100 x 200 x 30 cm Rakuten purchase price: 2880 yen 【Completely Waterproof】 The back side uses a highly breathable TPU waterproof membrane to enhance waterproofness, preventing moisture from sweat or water from reaching the mattress. Perfect for nursing care, bedwetting, and protecting against spills and stains on futons and mattresses. Great for co-sleeping with children or sleeping with pets. The side portions are also waterproof, preventing water from seeping through.