Dan, being that this is an experiment, I’m gonna use cheap materials. I have a blue foamie - I think thickness is 1/2 inch or so. I hadn’t thought about cleaning. Perhaps if it works okay a solution will be needed, but I wanna test it out first.
Ozzy, the jacket, a Sierra Designs Hurricane LT from ages ago, is slightly over-sized so I hoping this will help with mobility issues you mention. Your right, one way to find out!
Daryl, I remember seeing some of you posts on foam vest, etc. Cool stuff. This idea is slightly different. Imagine an R1 grid fleece but made from foam squares attached to a wp/b face. When worn over a wind-shirt the effect would be that of a double wall tent with a solid inner fabric. Moisture could pass through the wind-shirt and condense on the wp/b outer fabric. The DWR on the wind-shirt would prevent the any moisture from being reabsorbed into base layer etc. The purpose of the foam grid would be to keep a gap between the inner wind-shirt and outer wp/b. Thanks for the link! Could be useful.
Thanks for the comments!