It's warming up outside - temps in the thirties - and humidity is high. It rained all night. This is perfect weather to see how much water vapor can pass through the holes I punched in the Thermoflect. I used plenty of insulation under the hammock, enough for much colder weather, plus a good warm down TQ with the Thermoflect as an outer layer over the TQ. I sewed a nice long footbox into the T-flect, so it stayed in place and fully covered the bottom 24" of the down TQ. With all this, I slept very warm, which I like. Fortunately, my insulating layers didn't get clammy. In the morning I could tell that they had moisture in them, but there were no areas that felt wet - not even the TQ footbox. This is pretty good performance by the perforated T-flect. Not perfect, but definitely worthwhile, especially when you consider that the added insulating value of the T-flect was helping to make me warm enough to give off all that moisture.
Coincidentally, today there's a thread on condensation under tarps posted by Roadrunner72, and HappyHiker's contribution to that thread has links to two short pieces on the very phenomena we're talking about. It's well worth the effort to give these two a bit of study. ("Read with muscle!") They are particularly helpful in understanding the role that emissivity plays in the perfomance of Thermoflect. I also like the fact that the second article was posted by "Frost."