boati

my head and arms outside and I'm warm enough, in just cammies and beanie. I have yet to tape the ends of the two bivvies together, When i"ve done that, and get inside of it, just my mouth and nose peeking out, the shemaugh wrapped around my face to get the air tight seal, It'll certainly suffice to 35F and maybe even down to 30F. I'll find out tonight. I"m not cold at all and I've been out here for half an hour. My legs are very sensitive to cold, so the bivvies are doing their job, even tho I've not pulled them tight around my chest

Garand

John in AR

There is a certain amount of acclimatization to be factored in - you'll be more comfortable in a given temperature if it's what you're used to. Sounds obvious to the point of silly, but it absolutely has to be factored in. Someone from Ft. Smith, Arkansas could be involuntarily shivering at 30 degrees, where someone from Ft. Smith, NW Territories could be more than comfortably warm. Put another way, even though person "A" is comfortable in a given shelter (in whatever state you're in), a different person in the same location but with a different acclimatization could be extremely uncomfortable and even in literal jeopardy, simply due to what they're used to.

My point is simply that when my brother and I were growing up on the farm in michigan, if the thermometer outside the front window said 40 or above, we didn't usually even bother with a jacket. Now, after nearly 40 years in texas and arkansas, I can't take that same environment anymore.

Dorobuta

again, you're re-inventing the cowboy bedroll. You aren't really doing anything new or untried. And without pictures, we don't believe you.

Garand

You know Melvin it was +43F yesterday afternoon up here, I was sitting on my back deck having a beer in nothing but a track suit.

BigBassMan

41 degrees, a warm spell!

Dorobuta

That’s comfortable camping weather. I’d welcome that on a late season elk hunt!