My Dad has one of those.
Those Army blankets were very good in extreme cold.
In January-February, 1961 or 1962, in Grafenwohr, Germany at 26-35 below zero, we were sleeping in the field, under the canvass taken from a 155 Howitzer, split-trail, fully combat ready clothed, and covered with our own pup tent half and our "Army Blanket" and we survived the nights.
I've been hunting since 1949, in severe cold, but I've never 'lived' that long in that kind of cold and wind.
The Army Blanket was a great piece of GI equipment.
To this day, I don't know how we all survived with nothing more than some frost bite {which is serious}, but we had no deaths.