[quote=ChrisFol
I have always wondered about air filled pads like the Aircore and NeoAir, during the winter season. Does the air inside the pad not become cold or is the material of the pad and the warmth of your body enough to warm the air inside? [/quote]

Yes, the air in it gets cold. Mine is an insulated aircore, so it's full of primaloft, which holds in some warmth. The neo air supposedly reflects some head but the air in a pad gets *cold*.

That's why (Even with the insulated aircore) I top it, and in cold weather also bottom it - with foam.