Rick
I have a Bibler Eldorado single walled "goretex" . Its the driest tent I have ever used. It will breath just fine, but be aware that there will not be enough "breathing" for you to breath - for this there must be venting. I even cook in it - as in melt snow and brew coffee and the steam warms the tent and goes righ on out through the roof vents. Stays dry.

Let me also say that I haveseen a lot of double walled tents in Winter where the outer shell was totally coated with ice (underneath) from water vapor from people inside. If the sun hits the shell it can melt and rain on the inner tent, not so with a goretex tent.

Jim