Two nights trip. Temperature highest at day time -5 C (23 F) and lowest at the early morning -26 C (-15 F).
Me and my father. I used the Super Light with the Overbag (Rated -40 F; - 40 C) and he used the Antarctic (Rated -60 F; -51 C).
First night in Hammocks and second night on wooden 'lean to'.
During Hammock night bottom insulation was same for both Exped Synmat 9 DLX + Fjällräven Ground sheet (half pad for each) side ways keeping the CSS away and for extra torso insulation. (I did actually forgot it outside from the hammock
) No wind, no snow fall -> no tarp.
My father is not used to sleeping in hammock, so he fell of the pad all the time. And that is why we did sleep the second night on ground. This was his first winter trip ever. Mysteriously he did not complain about the coldness when his feet were not on the pad and he woke up, he just said he did feel like he would fell of the whole hammock when maneuvering back on to the mattress when begin inside the bag at the same time. The second complaint was the fact that he felt that his feet were too high, I did hang the DB for him, so it was my fault. But no complaining about the coldness what so ever.
I was astonished that I did not need any other bottom insulation than the air mattress. My hammock was the SB, maybe it is so narrow and shallow that when sleeping on fully inflated mattress there was no CCS at all. I did feel a very slight hint of coldness through the mattress, but that did not keep me awake at all. And at temperature from evenings -18 (0 F) to mornings -26 C (-15 F) I feel like it was a some kind of miracle.
And here comes the praise to the Wiggy's bags. They are very robust in this kind of use. We did not remove any clothes when going to sleeping. Only our extra camp gear (insulated overall for me and down jacket + insulated bibs for my father) were left out for nights. And of course shoes. Everything else was kept over ourselves.
I had wool underwear, wool pullover, Ventile jacket and trousers, wool socks and partly wool under socks, fleece insulated wind stopper cap, polyester insulated leather gloves. All these were on during the day time activities. I also took my shoe felts inside to the bag to dry them for the next day.
It was very convenient just to sit in hammock and without any extra clothes changes to go in warm bag for a sleep and shelter!
And even more so at the morning: Just to get up and going without any need to find frozen jacket or trouser hanging near hammock and then jumping around with one foot the get trousers on.
And everything in my jacket pockets were also always near me: small head lamp, batteries to my camera, my cell phone etc. So no need to repositioning ever bit of delicate gear when going sleeping and no need to do it again reversal at the morning. Easy and elegant!
Second miracle was the fact that I did not use any extra head gear. I just closed the bag and slept inside it through the whole night. The small hole was over my head somewhere, so almost all my breathing was kept inside the bag. And no problems any kind of with the moisture. Praise the Wiggy's!
The wooden 'lean to' for the second night. We did not use the fire.