This is an unbiased, unpaid review by a casual camper that used to do some more serious through hiking. Now I’m mostly tent camping for a night or two, or, as in this case, spending a few nights in a rustic cabin or cottage. There is a fireplace in the cabin, but as I say at the end of the video it was actually way too hot the first night with the fire going. And while I have not thoroughly tested this bag’s rating, I can confidently say it is comfortable in below freezing temperatures. But how close or below 15F you can go, I can’t say. In any case, I hope you found this helpful if you’re looking for a new cold weather bag. It can be difficult now with so many choices and details to think about. Good luck and stay warm out there!