I've got both summer and 3-season with 900fp in them.
I've taken the summer to ~22* and took the 3-season to 3*
In both I was wearing just basic polyester baselayer leggings and shirt and fleec acorn socks.
Triptease, you're tough! that sounds like some cold nights. But hats off to you for pushing the limits.
I took my Wide Summer Burrow with 1oz over stuff to 28. With bluejeans and a fleece jacket.
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