Just curious if you guys are running a three layer system (base, insulation, hard shell) or four layer system (base, mid, insulation, hard shell) in the back country during early September. Trying to decide if I want to drop my fleece mid layer (sitka traverse) or not. I can't honestly see a situation in which I'd wear it unless I'm glassing, and even then, I've got a puffy to wear, which is lighter and a lot warmer. What say you fellow Roksliders?