Since used by the military, I wouldn't imagine this cloth material to be absolutely horrible - - but who knows.
Keep in mind, military contracts are awarded to the lowest bidder.
The coldest I've ever been in my life was at night at Camp Pendleton, after an 8 mile hump. My camies were soaked with sweat. If I didn't have a dry set with me to change into I probably would have gotten hypothermia.
If I only had one set of clothes, it would be wool.