No offense taken, but from everything I've read, Goretex doesn't perform well, if at all, in subzero weather if you are working hard and generating a lot of moisture-the reason being that moisture freezes inside the jacket or bag and prevents the liner from breathing. In my case, I haven't been in sub zero in my Goretex parka to test those results, so I based what I said on what the experience of others has been.

I do know that Goretex doesn't seem to work all that well in muggy weather either (cold and humid), at least mine didn't, but maybe it is better now.

In any event, my new bag just has some DWR coating of some kind, so at least for me, it is a moot point. My MacPac bag isn't Goretex or any of the other fabrics like it either and I've never had any problems with it at all, so I don't expect any with this bag under the conditions I intend to be in.