I'm probably going to order a 5 oz jacket for use in frigid conditions; double the weight of insulation should make this a real furnace and still only 16 oz in size Large!
Bumping this from the grave. I'm looking into getting a Nunatek PCT Jacket with 5 oz body and 3.6 oz sleeves. Curious how the Robic material and jacket has held up a year down the road. Also if yourself or anyone ended up purchasing a 5 oz Apex jacket and their thoughts on it. My use will be predominantly static glassing sessions while sheep hunting. This past season was a rough opener with cold and snow similar to an October hunt. Looking for something noticeably warmer than the FL Unpronounceable (Kifaru LPP is on the radar, but I like the 5 oz option and the weight of the Nunatek).