I looked it up too. I do grant them that some of them are a little more than just space blankets, but not much. Even the on the company website they say in winter you will not be comfortable, but should be able to survive in all but the most extreme conditions. Well, my down bags and quilts allow me to be warm and comfortable even in the most extreme conditions.

Even the military applications are described as for emergency situations, most notably for casualties. I highly doubt these are being issued currently as the primary sleeping bag system for the US, or any other countries military personnel.