Hello Mighty Adventurers!!

After spending 6 nights in my new Big Agnes sleeping bag in 30* and lower temps I have found that I love my bag... my top was always warm... no drafts... nice and comfy. However.... my bottom (or whatever was against the ground) was not so warm. The cold from the moist ground below me spent 6 nights seeping right through my sleeping pad and into my bones... so.. for those of you familiar with sleeping systems... I pose this question....

What type of sleeping pad is warmest? An open core, a closed core, or a foam (egg crate type)? The sleeping pad I have now is a Pacific Outdoor Ether Compact 6. It's what I would call an open core (you blow it up and it has several long, hollow, tubes filled with air). It seemed to me that the open tubes helped to bring the cold air closer to me instead of insulating me against it.

What do you all think?