I learned about under insulation before there were pads. <img src="/forums/images/graemlins/smirk.gif" alt="" />

In the early 60s I was on a Scout overnight in the snow above Harpers Ferry. I was sleeping between two blankets inside a sleeping bag and was toasty warm but my tent mate was miserably cold. I was so warm that I gallantly gave him one of my blankets...the bottom blanket. Within minutes I was freezing.

I dropped out of backpacking from the mid-60s through the 70s and upon my return in the 80's was happy to see the marketing of 'pads'. IMO, nothing insulates better for the weight than a CCF pad. But any pad will make a huge difference from going without.

FB