Purchased for 2680 yen. After opening, I washed it once but have not used it and have kept it in storage. The following is from the purchase site: ✁┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈ Brand: Kinenroll Color: Light Gray Size: Single - 105 x 215cm Material Composition: 100% Polyester Closure Type: Pull-on Care Instructions: Machine Wash 【Size】Single: Approximately 105x215cm x fits mattresses up to 20cm thick, suitable for futon mattresses (100x210cm). (The back has an all-around elastic band for easy attachment and removal) 【Smooth and Quick-Drying Fabric】Made of 100% polyester, it dries quickly after washing and is resistant to deformation and wrinkles, making it easy to keep clean. It is also absorbent and has antibacterial and deodorizing properties, making it comfortable to use throughout the year. 【Features】■ Completely waterproof! No worries about sweat or any other stains. It completely blocks all dirt and does not stain the futon or mattress. ■ Waterproofed sides, so you can rest assured even if liquid flows sideways. ■ Breathable waterproof material. Because it is a breathable waterproof material, there is no stuffiness or coldness. Also, dirt does not penetrate the bedding, and it can maintain a dry state, which slows down the deterioration of futons and mattresses, and prevents odors and mold. 【Protects the Futon Firmly】The fabric has a moderate thickness. Therefore, it firmly protects the futon from external dirt such as sweat. The seams are also carefully sewn with fine stitches. Therefore, it is very durable. 【Machine Washable at Home】Confident in its washing durability! Machine washable at home, so you can always use it clean.