Lowest iv taken mine was 20 degrees and semi windy. It certinally made it more comfortable to have an arm or so out of the quilt. And made changing much easier from a cold standpoint. Perhaps it made my quilts feel as if they were 10 degrees warmer then they were.
The big benefit if the wind block, the rest really was just added bonus.
I dont usually bring a lazy slug tube, but if the socks comes, that's how it's used.
It is floppy in the wind and makes a decent bit of noise if that bothers you.
It's a worthwhile investment for cold weather or severe weather like blowing sideways thunderstorms.
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