Apparently, signature that I used from 2006 no longer tolerated so now deleted.
I tried the HH radiant bubble pad underneath between the hammock and the open cell foam pad inside the HHSS. My hammock is hanging in my basement and it was so warm that I had to bail out within a couple minutes. The radiant pad seems to be the same size and shape as the OCF and I hooked the glove hooks to the OCF. I have a space blanket but have not tried it yet.
Last edited by jimmay; 08-30-2012 at 08:44.
I do recall that I was wearing a single set of winter baselayer clothing, some good thick (and dry) wool socks, and my wool buff.
I've never had much condensation issues...although I don't typically use the space blanket in my setup until it gets below about 45*F.
There have been a few times when I've noticed a small amount of condensation either sitting on top of the pad or underneath it when I've gone to break down in the morning, but never any appreciable amounts.
I used a space blanked I bought from REI in my HH expedition recently. The temps were in the mid 40s in the smokies and in the middle of the night I had to pull the space blanked out as my bag was getting too damp! I was warm enough without it (had a blue walmart pad under me too) and my bag dried by the morning.
Previous poster's experience is common. Before it gets stuffy, it does seem warm, because the air is moist, and evaporative cooling of the bottom layer has stopped taking place.
Then the air cools, water vapor condenses, and DWR becomes certainly not Dry-Water-Repellent. It becomes durably water-retentive or definitely wind resistant.
Reflective defies known physical laws. A shiny sheet instead of a shiny bauble, but leaving you steaming in a partial bubble.
From the point of view of a successful HHSS user, the contensation in edecambra's scenario was likely caused by an inappropriate combination of layers. The space blanket works when it is relatively close to your body heat, and is kept warm by insulation below the space blanket. The goal is to use a vapour barrier to prevent the water vapour coming in contact with outer, colder insulation layers.
The open cell foam pad goes below the space blanket as standard, and if you want to add extra insulation then it needs to go in the same place.
I'll stand by what I wrote about the attraction of shiny silvery layers, whether the attractiveness is to civilians or to technical consultants to medical and nursing staffs at hospitals who buy them instead of something less expensive.
Or are you implying that it's a MENTAL thing...and it mattered because someone thought it should matter, rather than it made a physical difference?
I'll grant...I've personally not tried substituting a trash bag in the space blanket's place on a freezing night...not sure that I personally would like to test that theory out myself.
If you opt to test that...I'd love to hear the results. Nothing like empirical evidence to make a point.
I was just at sports chalet yesterday and they had an awesome new one shaped like a bivi bag and it claimed to be a bit breathable too I believe. It was like a mummy bag.