I wouldn't be surprised if PFAS are being replaced by more than one chemical based on application, but specifically for the membrane layers, there's this: http

I wouldn't be surprised if PFAS are being replaced by more than one chemical based on application, but specifically for the membrane layers, there's this: https://www.gearpatrol.com/outdoors/a43241598/gore-tex-patagonia-expanded-polyethylene/ https://www.gearpatrol.com/outdoors/a43241598/gore-tex-patag... > That Hail Mary thrown out by Gore-Tex turned out to be ePe (expanded polyethylene): a new durable, waterproofing membrane that is just as efficacious at repelling water as Gore-Tex's original ePTFE formula — yes, that's short for Expanded Polytetrafluoroethylene — but without fluorocarbons.