I'm looking specifically for hoodless jackets. There seems to be a "product gap" between 2 and 4 oz fill weight as exemplified by MontBell's high FP lineup:
Alpine Light: 11.6 oz, 4 oz fill (800 FP)
UL: 7.6 oz, 2 oz fill (800 FP)
Ex Light: 5.6 oz; 1.8 oz fill (900 FP)
Looking at the above, there ought to be such a thing as a hoodless jacket with 3 oz down fill at around 9 oz or thereabouts. Does such a thing exist, from any company?
Best I can tell Patagonia Down Sweater is 3 oz fill but heavier than MB Alpine Light. I know fill weight isn't the only factor but I'm persuaded by various arguments that it is probably the best single proxy for down jacket warmth. It is also the single hardest stat to find, even from most BPL jacket reviews (one more reason to love MB for providing this info).
(Hoodless because I have a down hood as part of my sleeping system. If you want context or to question my needs, see my other thread "Ditching fleece…" in Philosophy/Techniques.)

