So.. I searched around and couldn't find any thread addressing this. Maybe there is one deep in the annals of the site, but I couldn't find it. I just got back today from a backpacking/ bouldering trip. It was probably about 25 deg last night. I had a horrible problem while in my HH. My feet were so incredibly cold, I didn't want to move. From what I gather the problem may be my pad (HH radiant bubble pad) , but I just wanted to see if anyone had suggestions. Thanks!