...As far as jacket warmth is concerned.
I have a Mountain Hardware hooded Primaloft jacket that has done well enough to keep me warm so far. However, in my quest to go UL, I am looking to replace it with Down. I'm just not sure what fill weight it would compare to in a hooded jacket.
Patagonia UL shirt ----------Fill weight: 1.99oz Total Weight: 5.9oz
Montbell Ex light ------------FW: 1.8oz TW: 5.6oz
Montbell UL inner parka ---FW: 2.5oz TW: 9oz
Patagonia UL jacket --------FW: 3oz TW: 8.3oz
Nunatak Shaka Plus --------FW: 4.75oz TW: 9.5
I know some of these are hooded and some aren't, but I believe the hood only adds or subtracts about .25oz of fill weight.
So, which of the above would be most comparable in warmth to Primaloft one? If it's comparable to nunataks 4.75oz of fill, I don't want to get a Patagonia UL shirt or ex-light and freeze my ass off. Conversely, I don't want to take the extra weight penalty of a garment that is twice as warm as I need.
So? Primaloft = 2oz, 2.5oz, 3oz, or 4.5oz of down fill?
P.S. Why isn't there an EN rating for Jackets? It would be nice to have a temperature comfort rating for jackets like they do for bags. It would be nice to see 40F when warn over a T-shirt, 35F over a long sleeve, 25F under a shell, etc...