Having a layering crisis ... for early march thru hike ... silk turtle baselayer synthetic short sleeve on top ... marmot fleece 100, or 200 fleece i have ... i was sitting around in about 40f with only my short sleeve and montbell down inner and thought if it was 32f or less, i'd be pretty chilly ... what "extra" if any insulation layer's do you guys use on long hikes starting mid feb, early march in GA, i know from a section i did that those mountains can get cold! .... i fear mine isn't enough, and i don't wanna carry too much either ... catch 22, take the 200 and be done .. or find another light cheap option ... already got other gear to get yet ... or will the down inner alone without backup be enough ... i'm a late night camper sometimes so i need the warmth for what 11pm brings ... even after miles, sometimes i can't sleep ..