I'm the kind of person that likes to eat in bed, and this mattress protector does exactly what it says. Any beverages I've spilled on the bed have not soaked down into the mattress. My mattress looks just as pristine as when I bought it because I got this protector at the same time as the mattress. I've had it for about 8 months and it's the kind of thing you never think about because you can't feel it under your sheets. It just sits there and unobtrusively does its job, and I love that I don't have to worry about it. I have a queen sized mattress of average depth and it fits with plenty of room. I'm thinking that there might be enough room to put a featherbed under it when I finally decide to get one. Great product, I highly recommend it!