by tim » Fri 23 Oct, 2009 8:22 pm
I have a Snugpak Softie 3, which is their smallest/lightest bag. It isn't hugely warm, by any stretch of the imaginagtion. It's rated for, from memory, +5 comfort, 0 extreme. That's a bit generous, but is reasonable if you are using a bivy bag. My understanding is that the bags have a layer of 'reflectotherm', which is pretty much a space-blanket fabirc with holes in it for breathability which gives them that bit of extra wamrth.
They are, however, insanely light. Can be a good trade-off. I just purchased at softie 6 (the next model up) because the 3 is pushing it in warmth-wise in some of the more southern places it has visited (and because I couldnt be stuffed shopping around). Wouldnt recommend a 3 for central tas...
Cheers