What do you guys think will be a perfect setup for cold weather (20/30 degrees)? I'm trying to give some pointers to my friends who are going camping with me this weekend. They have a nice gear list:<br>-good sleeping bags (20-0 degree rated)<br>-thick matts<br>-fleece, windstopers, hats, rain gear, etc<br>-wool socks<br>-4 season tents<br><br>Any tips on how to keep warmer at night. I personally don't have any temperature control problems since I'm usually knocked out in 5 seconds and sleep like a baby in my bag. But I kind of worry about them. I just want it to be a comfortable outing without any major stress and problems for them (or me). Any tips on what should be done when they get cold? Or any extra gear that should be brought?<br><br>Matt<br>