Do you have any idea what you're talking about? When's the last time you even picked up a diaper, let alone a used one? The inside of a disposable diaper is not made of plastic. There's a layer of fabric, under which is a pad of stuff that absorbs liquid. That pad of stuff is so effective at absorbing liquid that, unless you let it get completely saturated (say... by not changing the baby for several hours), it will draw moisture through the fabric layer so well that you will have a hard time feeling any moisture on the fabric itself. I have changed wet diapers that do not feel wet. Cotton, on the other hand, will just hold all the moisture right there, at the point of contact.