Good find. Two comments-the article says that women sleep colder than men. I'm not sure about that generalization. Second, the difference between ratings in one table shows that American bag makers overrrate their bags compared to European makers. Probably not the case for WM, FF or the other premium bag manufacturers, but anecdotal evidence seems to support the overrating claim. I've read plenty of complaints, especially with lesser known brands and cheap bags about misleading ratings.