Temperature ratings are always subjective. I have a WM Super Antelope (dry loft outer material) and for me it is basically a 20-25 degree bag. I sleep cold and am small. My biggest gripe about the bag is that it is too wide. I have a "short" but would like it if manufacturers would proportionately size stuff - not only shorter, but a lot narrower. The bag also has more than needed loft in the foot and shoulders, and not enough in the hip and leg region. Perhaps I am the only person out there that is not pleased with my WM bag.

In other words, fit is as important and loft and the only way you can judge the fit is to get in one.