This is a type of waterproof sheet that significantly reduces the burden of housework! I bought it online as a spare, but it dries so quickly that one is enough. It's a white single-size (210x100cm) sheet with urethane coating for waterproofness. It's a flat type sheet that secures to the mattress by hooking the elastic on the four corners, not a fitted sheet type. ↓↓ Quoted from the purchase page ↓↓ ・Overwhelming quick-drying power → No need to worry about whether it will dry today ・Use as an under sheet → You can use your favorite sheets as they are ・Does not use the pile fabric common in waterproof sheets → The fabric is thin, reducing stiffness ・No pilling, no lint or hair tangling → Easy maintenance, no hassle ・Passed the dust mite passage test → Blocks dust mites ・Formaldehyde-free → Gentle on children ・Dryer test passed → Dryer use up to 60 degrees Celsius is possible ・Antibacterial test passed → Prevents the growth of bacteria that feed on sweat and sebum I'm actually using it, and it's a clean white color, doesn't pill, and isn't stiff. (I put a regular sheet on top of this waterproof sheet) I only opened the outer bag to check the contents this time, but I haven't opened the inner bag. (Please check the images) Thank you.