Topic

uninsulated legs = heat drain?

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PostedJun 23, 2008 at 6:12 pm

Some folks have hijacked my other thread so here is a new thread..

If you are using a quilt with a full insulated footbox with just a torso pad then 800+down will easily compress if even some part of the legs touch the the ground. Chilly legs are alright but what I want to know is whether they act as heat drains? If legs get chilly does body lose heat overall? that could compomise the insulation of my setup.

(-from the previous thread, edited)
An expriment I am interested in is keeping my legs crossed while sleeping on my back and legs curled when sleeping on my sides. I will need a wider girth at the bottom of my quilt but the overall weight can be significantly reduced and it will be warmer because of less surface area.

I opened up the footbox of my quilt to try sleeping with my legs crossed. Too fussy. And foot girth is a bit narrow to prevent draft.

Then I slipped bottom bit of quilt under my the bed. less fussy. I think a 3/4 quilt with bottom attatched by zip or ominitape to 3/4 pad would be best for this style. But you will need to loosen up the whole quilt everytime you want to change pose.

PostedJun 24, 2008 at 2:42 am

I know that if I am in a mummy bag And I am too hot I can pull the bag down and expose my neck and chest. I can then get very cold and unable to sleep until I cover up. If I unzip the foot and stick an arm and a leg out. I can sleep much better even when the arm and leg are cold. However it is not as comfortable as being warm all over. I would not design a system that did not try to keep the whole body warm.
As I have described, even where the comfort of an inflated down mat is not needed, I have used 3mm or thicker foam ontop of my rucksack at the foot of my top bag to fill the gap in the insulation. I have added a down filled compartment to make a complete down end but the down only goes about 2" under my feet and overlaps the foam 1".

CW BPL Member
PostedJun 24, 2008 at 2:52 am

I always use my legs to regulate my core temp by putting them out of the bag (usually just 1) if I get too hot. I believe you'll lose heat slower through them than your arms and obviously slower than your core because they're the farthest extremity from your core. I believe this is also why I can survive pre-winter temps (40s) in shorts and a long-sleeve shirt.

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