Proton SL Hoody Men's

I was looking for a lightly insulated jacket for climbing and hiking that was packable that would be burly enough for an outer layer. The jacket packs well into it's own hood, but clipping the elastic seems a bit tenuous, and I'm more comfortable storing it in a small bag. The only thing I was disappointed with was durability. On my second or third real outing with the jacket, we were doing some moderate scrambling. Sadly the shell got punctured by a wayward branch, and has a small ~1cm hole and some loose threads. While I was very comfortable on the 50-60F hike, I was a bit disappointed a jacket that costs this much was already showing wear 3 weeks into ownership. Wish they hadn't discontinued the 40D version. I am 5'11", 170 lbs. with a 42" chest, I usually wear a medium, but a Large fits me very well all around, chest, torso, and arms.

Originally intended to go for proton LT but they had run out of my size so went for this one. The LT is a lot warmer, but still the FL is good enough for spring, so the LT would have definitely been too warm for summer nights. Works great as a mid-layer under my beta AR. Wouldn't use it as standalone for hiking as it doesn't look very snag-resistant (could be wrong though). Would be great if arc'teryx offered better colours. Cobalt moon looked washed-out

I bought this jacket last ski season, used it on a cool spring skiing day and almost froze because the cool air penetrated right through the jacket. Disappointed, I put it away and felt the jacket was useless for skiing. After a year, I decided to try it one more time before donating it. I took it out this winter and spring and used it as a mid layer with a light shell over it. It provided great insulation in the arms and body, and, when jumping into a chute for a fast speed run ~45 - ~55mph, you could feel the insulation on the arms put enough distance between the skin and outer layer of the shell (instead of pressing the shell against the skin/thin-turtleneck layer) as well as the chest area. On warmer days 40F, using a feather down mid layer, I would build up enough activity heat to begin to sweat, and would open the pit zips and hip elastic to no real heat relief. But with the Proton's huge air permeability, air filtered throughout the jacket and even the up the arms to prevent breaking out in a sweat. Now this is my go-to skiing combination. A shell outer layer, with pit zips and hip elastic, the Proton, and on very cold days, a vest with insulation on the chest and highly air permeable side and back panels. Also, the Proton hood fits over a helmet and provides a great layer of insulation when the chairlift ride has a lot of cross winds especially from the side. My Proton won't be donated. It is now a keeper.

After reading previous reviews and contemplating purchasing this jacket I was concerned that it would not provide adequate wind resistance and that it would not be warm enough. I can confidently say that I have found neither of these to be issues. While not completely wind resistant the Proton FL still does a good job of taking the bite out of cold winds. It has also kept me comfortably warm with just a t-shirt on underneath in 2 Degrees Celsius and the hand warmer pockets are quite a nice feature as well. Overall I have found the Proton FL to be a great choice for activities and casual day-to-day wear.

Bought this because I'm not a standard fleece hoody fan. Still need something over a t shirt. This jacket is great so far, from minus 7c to plus 13c. Fits snug but comfy, 5ft 11inch, 175lbs bought a medium. Shipping was fast as usual.

I've owned this jacket for about a month now - it is great for walking around in the city at temperatures between 40-70 degrees, which is exactly what I wanted it for. The breathability is great. The only downside I've found so far is that the main zipper unzips when walking, which is pretty annoying. Adding a bit more friction to the mechanism would stop this from happening.

I purchased this jacket a few months ago with low expectations since I bought it on a whim using a coupon. It has exceeded my expectations and quickly become one of my favorite Arc’teryx pieces. A year-round jacket with ample amount of pockets and a great fit. I’m 5’9” ~160lbs and the medium fits me perfectly. I have a longer torso so the jacket falls just below my belt line and the sleeves are just the right length with a little extra for activities needing to stretch the arms. I’ve put this jacket to the test backcountry skiing and romping around in the southern Utah desert so far and have zero complaints. The lined hand warmer pockets is a huge bonus and was a nice surprise when I tried the jacket on after it arrived. Looking forward to testing it on in other seasons and activities but so far the Proton FL is a must have!

Best jacket I ever had. Perfect fit. Great features.