I purchased this mattress pad for a twin guest bed. The waterproof ability hasn't been tested yet, but I can comment on the quality of the mattress protector. I was concerned that the mattress protector would crinkle like waterproof mattress protectors from the past, but this mattress protector makes absolutely no noise and provides a bit of extra cushion to the bed. So far, no one has noticed that they were sleeping on a waterproof bed. Nice product. Would purchase again.