Agreed on a rain jacket, but I think we are talking about different things. Rain is one thing, moisture movement next to skin because you’re wet on the “inside” is another. I’m talking about moisture moving from skin layer to the outside, not keeping moisture outside of the puffy from infiltrating into it.
What I was saying in that post is that Stone Glacier’s treated down will move moisture from inner layers to the outside atmosphere without the down becoming saturated and losing its loft. Traditional down will saturate with moisture as it moves from skin layer out, and lose its insulation properties. If you have to carry an additional synthetic layer to accomplish the same purpose with a traditional down garment, why not just use the water resistant product? This all assumes that Stone Glacier’s marketing is 100% accurate, and it also assumes that all down garments actually do saturate and hold moisture as much as everybody says they will.
A real rainstorm is a different conversation, and you are correct, I never go anywhere without a rain jacket in the bottom of my pack.
And ditto on the lack of durability of a puffy coat.
I’m not sure how else to explain it, sorry if I’m not making sense.