These are brilliant! Buy two as they take a while to dry as you can only tumble on a low heat or line dry or slowly on a horse. Oh, and you mustn't use fabric softener when washing as, like with towels, it affects the absorbency. The reason for this is because they are so absorbent. With the plastic style under-sheets, your child ends up lying in a puddle, but with these, the moisture is drawn into the sheet. They are placed on top of the fitted sheet, and the child lies directly onto the soft, quilted top layer. The bottom waterproof layer feels soft, but is completely waterproof. I'm very impressed.