navmanWhile these bags haven't undergone EN testing (which is a test for sleeping bags, not quilts), from my research they should the roughly around 20 lower limit. About 31? Comfort (iirc).
If you've never slept in a quilt before you should definitely read up on it. Many people don't realize they need to do a few things differently and end up cold (usually improper sleeping pad for temp or no UQ for hammock, or not wearing a hat or balaclava etc.