My husband and I do not have babies and I am not pregnant, so I wasn't looking for those thick plastic water proof mattress covers. All I wanted was something thin and breathable that is comfortable to sleep on but provides a little bit of water-proofing for my husband who has a tendency to sweat a lot in his sleep. I didn't want to have to worry about our mattress getting gross and stained with sweat, but I didn't want him to be even hotter by the non-breathable kind of protectors. This one served just the purpose! When it arrived I was a bit skeptical. But when I put it over our mattress, and topped it with our usual sheets, I was happy that I didn't feel hot, and it wasn't making any uncomfortable plasticy sounds when we move on the bed. My mind is at ease to feel that the next time he ends up sweating in his sleep, I can just snatch all the bedding along with this mattress protector and wash them all! Now that issue is out of the picture, I am off to hunting for moisture-wicking sheets : )