Damn I wish I could try this with you guys! I hung at -5 last November (I think?), and then again at about -10 over Christmas. A lot of fun and a damn site more comfortable (especially whilst cooking and eating before bed) than my friends who are ground dwellers, the benefits of a hot seat when it's that cold can not be overstated. I remember seeing -16/-17 a few times on my commute to work across greater Glasgow so I'm sure you'll be able to find some beasty temperatures into the Highlands
I was hanging with a down UQ from unsponsored (I'd rate as a 2/3 season as I sleep cold), a thermarest, -5 down sleeping bag, blanket, and layering up my sleep wear to wool longjohns & top plus, plus MOD arctic socks, a microfleece and a down bodywarmer as necessary, wool liner gloves, wool buff, and two hats.
I think if I were to plan going out into those kinds of temperatures I'd invest in a 4 season UQ, adding a thermarest is a poor solution as it really reduces the ease and comfort of the lay IMO. A fleece liner would be another addition, and maybe a second poncho so I could rig doors to try and raise the ambient temperature within the shelter. A couple of tea light lanterns could be a good addition too.
I'd like to try Shug's frost bib as well. On the first trip I wrapped a scarf around my face and woke up with it crisp with frost and ice. Not pleasant but better than an icey sleeping bag. Not sure how reliable the bib would be through the night as invariably I turn over in my sleep.
I was hanging with a down UQ from unsponsored (I'd rate as a 2/3 season as I sleep cold), a thermarest, -5 down sleeping bag, blanket, and layering up my sleep wear to wool longjohns & top plus, plus MOD arctic socks, a microfleece and a down bodywarmer as necessary, wool liner gloves, wool buff, and two hats.
I think if I were to plan going out into those kinds of temperatures I'd invest in a 4 season UQ, adding a thermarest is a poor solution as it really reduces the ease and comfort of the lay IMO. A fleece liner would be another addition, and maybe a second poncho so I could rig doors to try and raise the ambient temperature within the shelter. A couple of tea light lanterns could be a good addition too.
I'd like to try Shug's frost bib as well. On the first trip I wrapped a scarf around my face and woke up with it crisp with frost and ice. Not pleasant but better than an icey sleeping bag. Not sure how reliable the bib would be through the night as invariably I turn over in my sleep.