Not sure if this should be in here, or General, but since this covers " Technique" I thought it may be close. Mods please move as you see fit.
We had a survival exercise last weekend. Daytime temps were ~70, night time temps ~50. No problem.
light LS merino top all day
Heavyweight LS cotton uniform shirt (required...ugh.)
50/50 cotton/poly uniform pants (only other authorized pants were 100% cotton, ugh.)
Polyprop liner socks
Heavyweight merino socks
In the pack:
Merino glove liners
leather gloves for rope-work (gardening gloves essentially)
merino neck gaiter
fleece balaclava (usually folded up and just used as a cap)
Second light LS merino top
light merino bottoms
uninsulated wind jacket (Eddie Bauer Scirocco)
I also had a heatsheets + SOL bivy (neither of which I used), a homemade-Tyvek Homewrap bivy (maiden flight, testing!), and a 5x7 cheap silnylon tarp.
We were allowed no lights (or anything which illuminates at all), no fires, no sleeping bags, nothing with an on/off switch, no food, no watches.
Tarp setup in the required location, slight hillside. Flatten a little in the remaining daylight (I'm 6'6" 230), tarp guyed out on the uphill-side to the ground, downhill side raised slightly on a pair of trekking poles. Lots of dry grass on the flat stop, bivy on top.
Cotton shirt is wet from the day's exercises, as is the merino top. Cotton comes off over a bush to try and dry it out while I set up the tent. Put the (dry, packed) merino layer on, the damp merino over it, the damp cotton over that. Merino legs on, under the 50/50 cotton/poly pants. Boots stay on but unlaced. Merino neck on, stretched up over the head, balaclava "cap style" on. Merino lines and leather gloves on. Legs up on pack. Targetted temp was 50F.
1) Too light on gear for 50F without getting into the Tyvek bivvy?
Dark hits, temps drop as expected. I start getting cold. Put the windbreaker on under the cotton shirt (to protect the light windbreaker a little.) Ground insulation okay, but I can really feel the heat escaping on top. Guessing because I'm damp, heating it up and it's just carrying all the heat away from me?
Get inside the Tyvek bivy. Holy crap it's really really really really loud even after softening it up.
Still feel the heat escaping both sides pretty badly. Duck down inside completely, can't feel feet, violent shivers now and then, but they didn't really feel uncontrolled. (Note, alum sheet + SOL bivy still packed but on my mind.)
Getting a bit colder. Mentally thinking this sucks. But it's only about 50F, I'm a wuss. Thinking that it sucks that I'm a wuss.
Wake up often; instructors come by periodically, don't pull anyone until the "pack up time" sometime just as the false-dawn is popping up ... guessing around 6am (remember, no watches.) I'm dry, and achey (mostly in my back) and can barely stand up. I am dry.
Pack up, still cold out, get walking and moving gets the heat up well. Head to gather point and get a lift to the camp with a small fire going, coffee, etc.
Forecasted temp was 50. Actual temp ended up being 36F and slightly foggy.
1) How would you have handled the wet clothing? Put it inside with me as best as possible until it dries? It did seem much worse in the beginning of the night, which I am attributing to being wet and evaporative cooling losses.
2) Should I have gone with a normal A-frame instead of leaning it? I was mostly worried about the downdraft at night, almost no wind sidehill...very still.
3) I did not use the emergency blanket or SOL Bivy(by choice, I figured I was just being a wuss and it was only 50F.) Outside of using one or both of those, what other adjustments do you think could have helped?