I've used a ThermaRest and a TNF Cat's Meow down to the mid-upper 30's in a HH classic entry(bottom) and was almost too warm, not warm enough to vent, but warm enough that it could have gotten colder and still been fine
We all know of the original
"Walk off the war
" thru-hike - but, check out these
guys, they're helping folks 'walk off the war' today -
Donate to help fund gear for the warriors who are coming back home and need help walking off the war!