Question for ya. I have my military arctic bag which is unbelievably warm but way to big to pack. So me and my wife bought Kiui bags extremely lightweight and easy to pack. We froze in them on a hunt in Colorado. Another person on the hunt said you need to strip down to nothing for those style of bags to work? Any body hear of that? In my military bag you could leave your long Johns on if you wanted to. We did strip down and it helped but not very happy at the cost of these bags . What do you do if the weather turns really bad and you can’t leave clothes on?