- Familiarity: I've used it several times
- Fit: True to size
- Size Bought: L
Just when I thought I couldn’t possibly love another Arcteryx jacket as much as my Atom LT - I purchased the Proton FL and was proven wrong. This thing keeps me warm on chilly mornings, and it absolutely DUMPS heat when I’m workin’ hard. I started a run at 38 degrees, a little chilly, but the jacket kept me comfortable... and I didn’t take it off during the entire run, despite the sun and a 20 degree temperature increase. This thing is amazing. And the mesh lining inside is really pleasant on the skin. I’ve even started opting for it when working on the laptop on the porch over my cozy knit sweater. 10/10 would recommend. Worth noting if you have experience with Arcteryx jackets: I have an Atom LT and a Proton LT and (at my tall height) I prefer the fit of the Atom over the Proton... my main concern in purchasing this jacket is that I’ve never liked the fit of my Proton LT as much... however, the fit of this jacket is just as comfortable as the Atom LT - Similar length in the arms, and a slightly longer torso than the Atom LT.