I bought the Green XL. I am 6’1″, 185lbs, 40″ chest under armpits, 33×32″ pants, athletic build.
The Green XL fits acceptably. I wish it was slightly smaller as I will only have a thin active layer under it most of the time, but for $20 it will definitely work fine. Its sized similar to my Arcteryx Zeta AR shell in Large. I’ll take some pictures tonight with various layers underneath.
Per the darth vader breath test, I am able to breath through this very easily, like I can exhale a full breath in nearly a normal amount of time if I push hard. We have not had wind to test it in since I received it, but I put it over a 330cfm 6″ diameter centrifugal blower with the output reduced to 4″ diameter. it dead heads at 1.8″ water column. Assuming the neck-down produces ~.5inwc with ~200cfm flow, that puts the output velocity at ~26mph. Assuming any of that is close to correct, I cannot feel a breeze through the shirt with it about 2″ away from the nozzle. Im not sure how wind speed converts to inWC static pressure, but my unscientific testing says you need close to 1.5″wc to feel a noticeable breeze through the fabric.
That said, it does seem to breathe extremely well.
Argon 90 is rated at 40cfm according to what I read. That is very hard to breathe through. If Argon 90=40CFM, then I would think the fauxdini is well over 200cfm. its easily 5x more breathable, and likely much higher than that.