This is the Nitori Waterproof Multi-Fit Sheet, Single size. I purchased this for my child's bedwetting, but it's no longer needed, so I'm selling it. I used it for about 3 months after purchase. I washed it every weekend. The waterproof function is excellent. I have three sheets, which were used as replacements while the others were being washed after bedwetting incidents. Please let me know if you'd like to buy them individually. Thank you.