Is it an insulated air core or just an air core? I have an insulated air core which is rated to 15 degrees. The regular air core is rated to 35 degrees I believe.
+1 on what but I would put the air core in the pouch and supplement laying it on the CCF so you dont have it sliding around. The CCF should stay put better than the air core. And I would only put about 1/2 the air in the air core. Windshield reflector should work as well if you do not have CCF
Have a great time, I will be out myself this weekend. Calling for single digits at night here in Ohio