Just wondering what others do, if anything, to "insulate" the foot and head of the beds in the bunk-ends (i.e. to fill in the gap between the mattress and the canvas wall)? In our old pop-up, I never had to use anything because the mattress filled the entire space. With the X23b, the mattress leaves a gap of a few inches at both the head and foot of the beds. I've used small blankets and towels to fill the gap, both as an insulator and a bug shield (the front bunk has gaps big enough for things to wander in to), but was just fishing for other ideas.