I want to ad my 2 cents worth. I am in Alaska and find myself camping in the course of trying to find bears, sheep, and moose on occasion. I have camped when the thermometer has reached into the single digits. Sir, what you need to do is invest in A Wiggy's sleeping bag system. I am in no way connected to, nor trying to advertise for them, but I can tell you those bags will save your life. No BS. They somehow wick sweat, or even moisture from a jump in a lake away from you while you are in the sleeping bag. it is truly amazing and they work. I will NEVER sleep in any other sleeping bag, even if I am deployed to Iraq or Afghanistan, this is the bag that will go with me even though the AF issues a pretty good sleep system. They are on the web at www.wiggys.com
Truly outstanding product. I invite you to just look them up and read some info that is on their website. However, what you had on the ground for your backside was fine.