Historically Gore has made their membranes from ePTFE. Other companies have made their membranes from electrospun PU due to Gore's patents. My understanding i

Historically Gore has made their membranes from ePTFE. Other companies have made their membranes from electrospun PU due to Gore's patents. My understanding is that PU is widely viewed as inferior to ePTFE for performance and durability. So if Gore plans to switch from ePTFE to PU, it's a step backwards in terms of performance. This at the same time that the industry has switched DWR coatings from C8 to C6 and soon C4, which while more environmentally friendly are significantly less effective and durable. At some point we're going to just move away from WPB rain gear and go back to waterproof but nonbreathable gear (e.g., silnylon and silpoly) and rely on mechanical ventilation (pit zips, 2 way front zips, wrist and waist cinches) for breathability.