Gaps inside heads?

First of all, a warm hello to everyone here! I am brand new to fur suiting, and the whole furry community in general really. I've done a lot of browsing, learning, laughing, and going "awww" or "that's so cool" at some of the great suits I see.

Anyway, as I venture into planning and creating a head of my very own (I mean besides the one I grew), I had an idea for increasing ventilation inside the heads, and I didn't find any mention of it in the archives. If you put strips of foam (say, .5" thick by 1 inch wide) around your head, down the sides, etc., making the contact your head in strategic places instead of all over, would that be helpful for increased air circulation? Would it make the head too loose? I haven't worn one before, so I'd believe a "No, it needs to be tight and form-fitting" answer. I wouldn't want a sudden look to the left cause my character to now be looking behind me.

Obviously this is not appropriate the balaclava method, but an idea for all-foam or mesh method. I'm pretty confident this would have to be included from the start (unless one's natural head has shrunk -- and then you probably want to seek medical attention rather quickly), so I thought I'd ask some experienced folks now, before I start. :)

Thanks!