This is a set of two absorbent box sheets. The back is made of water-repellent fabric and has a firm, sturdy construction. The size is wide king (200 x 200 x 30 cm), and it has elastic all around, making it easy to put on. I am selling these because I accidentally bought the wrong size. One was opened, but it didn't fit, so I put it back in the bag without using it. Please consult the comment section if you wish to purchase only one sheet.