![Amazon.com: Arc'teryx Proton FL Hoody Women's | Fast and Light Breathable Insulation - Redesign | Vitality, XX-Large : Clothing, Shoes & Jewelry Amazon.com: Arc'teryx Proton FL Hoody Women's | Fast and Light Breathable Insulation - Redesign | Vitality, XX-Large : Clothing, Shoes & Jewelry](https://m.media-amazon.com/images/I/71XlFtl64kL._AC_SL1500_.jpg)
Amazon.com: Arc'teryx Proton FL Hoody Women's | Fast and Light Breathable Insulation - Redesign | Vitality, XX-Large : Clothing, Shoes & Jewelry
![Proton FL is a winner. In a 2-layer system of only a Proton FL and Theta AR I was warm at 25F degrees, across 17 miles of moderate terrain/elevation in medium snowfall Proton FL is a winner. In a 2-layer system of only a Proton FL and Theta AR I was warm at 25F degrees, across 17 miles of moderate terrain/elevation in medium snowfall](https://i.redd.it/z9brn6xz96k41.jpg)
Proton FL is a winner. In a 2-layer system of only a Proton FL and Theta AR I was warm at 25F degrees, across 17 miles of moderate terrain/elevation in medium snowfall
![Arc'teryx | Jackets & Coats | Arcteryx Proton Fl Hoodie Mens Large Proteus Color Like New Condition | Poshmark Arc'teryx | Jackets & Coats | Arcteryx Proton Fl Hoodie Mens Large Proteus Color Like New Condition | Poshmark](https://di2ponv0v5otw.cloudfront.net/posts/2023/02/13/63eb18a174bdbed7eac3bee5/s_63eb1a1292e49198be6b5e45.jpeg)