Mark: I think that weight is for a R, with a long around 15-16 oz.
The weight gain is from 1.3x the insulation (the "60" is actually "68" g/m2) and the heavier shell fabric. The warmth difference is more significant that 1.3x (loft alone), because of the lower air permeability of the shell fabric.
Yes, the PRO 90 Quilt is designed for:
a. An overbag over a down quilt or the UL60 or UL180 quilts when external moisture is an issue.
b. Alone in wet and "warmer" conditions.
As for May-Sept in the wet lowlands, it's going to depend on what you wear in the quilt and how you sleep, etc etc etc. There is so much involved in temperature ratings, I'm not even going to go there anymore. I'm hesitant even to discuss loft, because for synthetics, they are warmer for a given loft than down, due to less convection and better radiation loss resistance. What I'd rather do, and hopefully we'll have that data within the next eight months as we wrap up our testing, is publishing copper mannequin heat loss data, comparing a synthetic fill quilt to a down fill quilt. Preliminary results suggest that when dry, the insulation on a warmth:weight ratio suggests that down has an edge. Synthetics have the edge on warmth:loft ratio. Add only slight bits of moisture (not even enough to reduce the loft of synthetic, but enough to reduce loft of down), and it's almost no contest: synthetics prevail.
A few years ago Glen Van Peski, Alan Dixon, and I got caught in the Wind Rivers in a snowstorm and spent 16 hours in wet, down 1-1.25 lb 800-fill down quilts. The temps went down to about 15 degrees at night. We'd already slept in them 4 nights, including a wet night the night before the big storm. We made it thru the night ok, but it was not terribly comfortable. That's not a testament to down, or an argument pro-synthetic, just that your body has an incredible capacity to adapt to cold conditions upon exposure, and your comfort in a bag should not be evaluated in your backyard. So, if you're gig is one-night camping trips, your best bet is to take more insulation than you think you'll need: going from warm bed to cold ground is sort of … an abrupt change for your body!
I sleep sorta cool, so the prospect of taking any thin quilt quilt to freezing Ontario rain in May doesn't sound appealing to me!
BUT having said that,
I've been pretty comfortable with the thin 60/90 quilts and the Cocoon Pants and Hooded P/O into the 30s on a long distance walk when my body was accustomed to the cold already for several days.
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