Michael – Not being expert in the way the whole system works I can’t be 100% sure of my answer; but in principal I see no reason at all why a liner jacket wouldn’t work perfectly well with any outer layer that was capable of slowing a raindrop sufficiently to prevent an aerosol that would penetrate the liner (i.e. something windproof).
From what I hear of the new Paramo offering (based on my idea perhaps? I’ve not asked them. And I made it public domain so I’m not worried if it is – only pleased :) they plan to have a range of outer shells which I assume will offer more than simply colour changes. I assume it will be fit, weight, features. But I also expect the shells will all share the basic feature of slowing the rain drop velocity sufficiently.
> Why isn’t any American company using this?
I don’t know but can only imagine that it’s such a bizarre concept that no one has bothered to look past the oddity of it to see if it really works. It appears to me to have taken longer to get “traction” in its home market than its performance deserves.
But also I think your next question has some bearing on this:
> Why are the designs so darn ugly?
I just don’t know!
Though to be fair, although the older designs are horrible – the newer stuff is looking far more technical.
One thing that’s not been mentioned is that it seems more and more Mountain Rescue teams in the UK are choosing Paramo as their main kit. I know Cioch (who make their own jackets from Paramo’s materials) have supplied a second set to the Cairngorm MRT for example. And they cover one of the very toughest areas in the UK with true Arctic conditions over the winter.

