Mat-bed question

[Akire]

What order would you put the following? Camp bed- SIM-foam roll mat? It feels most comfortable with Bed-SIM-roll mat but not sure what be Warmer. Many thanks!

Do whatever feels most comfortable. Since roll mats and the core of SIMS are both foam I should think they are the same in terms of insulation.

Air is an insulator as well, so the sim might be slightly warmer, but im not sure if it would be noticeably so

I'd ditch the foam mat and just have the sim on the camp bed.