Long story short I thought it would be a good idea to hold a fish against it and clean fish wearing it. Not the smartest thing to do when animals around. So I tried submerging it in a washing machine full of water. Long story short it took a lot of effort and time to get and hold it under water. Soaking it wasn't as easy as I thought. I don't think I got it all the way wet.
After that and getting my quilts damp with dew (in a shelter or cowboy camping) I'm not concerned with getting them wet.