The 3-season Incubator
-the 3-season is just fantastic. I slept outside last night; here in Kenduskeag, Maine it got down to below 20 degrees. And I was warm and toasty through it all. (I have an 800FP with 2 oz. of overstuffing)
Stormcrow figures that should be good down to at least 20F, but I can tell you it can go lower than that.
That said, whether you are a warm or cold sleeper has a good bit to do with it also. I generate a LOT of heat, so that helps.
"The green earth, say you? That is itself a mighty matter of legend, though you tread it under the light of day." -Aragorn, 'The Two Towers' by J.R.R. Tolkien