@Joe Thanks for reaching out!
We're going to connect with our Co-op Brands team to get answers to your questions. Thank you for bearing with us while we get the correct information for you. In the meantime, feel free to check out our Sustainable Product Practices page. Near the bottom of the page there is a section on sustainable chemistry that says:
Durable Water Repellents (DWR): Concerns about the toxicity and environmental persistence of certain durable water repellents (DWR) is driving a transition in the industry. As of 2019 product lines, REI has eliminated DWR treatments that contain long-chain PFAS from our supply chain. Use of short-chain PFAS alternatives is a positive stepping stone while we explore non-fluorinated alternatives, which we believe will eventually provide the best balance of performance and environmental stewardship.
We'll get back to you as soon as we have more information regarding your questions about the REI Co-op Rainier Rain Jacket and some options for winter jackets.