In reply to UKC/UKH Gear:
Nice review!
> The main difference between the two is that Performance Shell uses a layer of PU to protect the EPTFE membrane from contamination, whereas Pro uses multiple layers of EPTFE without a PU coating. Since PU coatings do reduce breathability, this makes Pro more breathable. Gore do not provide figures for breathability, so on paper we simply can't say how much better a more expensive alternative in Gore-Tex Pro would have been.
Unfortunately, that's not going to hold true for much longer. Upcoming Gore-Tex Pro will come in three different variants, two of which are significantly different and actually do use a PU layer with single ePTFE layer again instead of several ePTFE layers, all of them called Gore-Tex Pro but with different monikers. You can always count on the marketing people to muddle the waters
"Most Breathable" - pure ePTFE, sacrificial membrane layer to protect from contamination, now bonded to lighter (up to 30D) fabrics, more breathable (RET <6).
"Most Rugged" - ePTFE with PU, bonded to heavier 70-200D fabrics, more rugged than current Pro, less breathable (RET <9).
"Stretch" - ePTFE with PU, even less breathable (RET <13) but highly stretchy.
It seems the point is that jacket manufacturers would combine the three different materials in a single jacket with stretchy panels, durable panels and lighter panels.
I think you are going to need even more paragraphs to explain the technologies and differences in future reviews