Nope, just anecdotal experience. Have put some thought into it, but those thoughts don't completely pass the science test. In my opinion, folks get focused on the science of achieving heat loss equilibrium, but don't factor the physiological reactions of the body that involuntarily control heat loss. There's a good scientific explanation somewhere, though, and its not just perspiration and tight socks.
I don't want to argue about it here, though. I would ask that you focus on whether my solutions should be effective or not. Would you not agree that his 20 degree UQ, given reasonable top insulation, clothing, and fit of the the UQ ought to keep him warm in the low 20s?
My guess is that the OP has already tried more clothing, etc. and is still cold in the low 30s with his 20 degree quilt, and that's why he's asking us how to supplement in lower temps. Similar experiences are where my opinions derive from.
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I experienced a couple of cold nights in my 10f degree uq and tq when i first got them and that was fully clothed. Since losing layers of clothing and sleeping in only base layers and socks im now toasty warm, so id say get some good base layers to kip in and ensure your set up correctly.
I currently have a 20* underquilt that I plan on winter camping with as a 0* underquilt is not in the budget right now. I am going to put one of the Costco down blankets between my underquilt and my hammock. This should get me a few degrees lower. I am going to put some clips or something along the edges of the blanket to help hold it in place.
A factor that many forget to take into account is the human body and how much it varies in it's performance one night to the next.
Here are my tips for cold weather camping: http://www.arrowhead-equipment.com/w...eather-hanging
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A hot water bottle has saved me from shivering on more than one occasion. Better yet, it is multi purpose and adds no more weight if you already have a stove/bottle already. That is my favorite when the weather is questionable.
Eat lots of fuel!!!
Socks/uq protectors are great where the wind is more of an issue than the temperature.
Pads give you more insulation AND block more wind.
I will not comment on crinkly sounding stuff like reflectix and emergency blankets because they make noises that I dont want to hear in the woods... (hehehe)
Some clothes make me warmer but layering socks and tightly fitting socks in general tend to make me colder. It is all anecdotal for me and everybody sleeps differently, but most all of the tips are usable here
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Okey, just got in from a 20min test hang using a Thermarest pad, my 20° UQ, 20° sleepingbag, downparka on top and my DIY UQP.
Success!
The temperature has dropped to -12C ( 10F ) and i was warmer then last night.
The main issue was to stay on the freaking pad, forgot how annoying pad sleeping can be.
Nevertheless, had to get out of the hammock before i fell asleep, were that comfy at least
When going "live" out in the woods i'll for sure use a warm waterbottle...
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