CUrrent one is a 1 day special Beyond summit 300 rated to -5 (I guessing that's the extreme rating) and got a Thermotec liner. It's sleepable if you warm when you get in and have some layers on, but if I been hunting I'm usually wet and cold when I get in ( falling in a river at the start of a one night trip dosnt help). And don't like to carrying lots of clothes.
I wouldn't take it out if I know it's going to get below 5 not worth a bad nights sleep.
Thansk will take a look at black wolf as well
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