Wow! Brian, you have me excited. How do you feel about sizing? I'm normally a small in Patagonia but found the M10 a bit baggy in small. The x-small actually worked pretty well but was a bit tight when layering over an ultralight down hoody.
I need to figure out how often I will be layering. I'm wondering if I can use this in cooler weather instead of my 2013 Houdini, which per recent reports is no longer as breathable as before.