Arc'teryx  Proton Lightweight Insulated Hoodie - Men's

I've been super impressed by the comfort and performance of the Proton Lightweight Hoody. Taken it climbing on multiple occasions and have been really satisfied with how it moves and stretches under a harness. Similarly, it breathes well once you start moving on the wall or on the approach. Hood fits over a helmet as well. The inner fleece lining is incredibly comfortable and feels great. Warm when you need it and breathes when you want it. Would definitely recommend to anyone looking for a good climbing garment to keep you comfortable while climbing at the Creek in the fall or Yosemite in the spring. It's held up surprisingly well through the past year. I'm 5'8" 140lbs and elected for a medium where as I wear a small in the Atom. Felt like a medium was more comfortable for climbing related pursuits.

Have had this jacket for 5-6 yrs and am very happy with its quality and performance. I use it primarily for day hikes in cool to cold weather and have used it couple hundred times. I’m 5’11” 175 and medium fits me well. Fitted but not tight. With temperatures in the 35-45 range I find myself wishing I had more insulation but after a few minutes exertion I’m comfortable. The exterior is quite durable and sheds dirt well. I’ve been wearing Arcteryx since 1999-2000 and have my share of their stuff but this and the kyanite hoody get the most use. I also love my Proton LT but generally to warm for it most of the year in Georgia.

It is warmer and better than previously expected. First time I tried it in 15 degree Celsius (I'm living in Europe) in around 30 km/h wind with just a no name T shirt. I talked with my neighbour for an our and it was a little bit too warm. Next time I used with a merino baselayer in 9 degree Celsius in light rain and small wind. I drove car, went to shop and post office, so it was a normal daily use. I just shake off the rain drops from the jacket before got in the car. The jacket did an excellent job. I did not feel cold but I was not overheated when I was inseide.

The label came off after a month of use. Good layer for its intended use, but it's not very durable.

I got the Proton Lightweight hoody a few weeks ago. I’ve been wearing it during spring weather (sun, wind, dry and wet weather) with and without a Arc’teryx shell. I get warm fast with some fleece, but this jacket maximizes breath ability with out sacrificing warmth. Very practical pockets (sides pockets are línea with warm fleece). I like that it zips up high and the hood somewhat disappears when I’m not wearing it. Packs light so you can carry it anywhere. Great versatile piece for anytime (could easily replace your cotton hoodie)

The Proton FL (old version) has become my go-to winter active jacket. For XC (skate) skiing or running I find it comfortable over just a base tee from about 25-35F, a bit warmer unzipped and colder with a long sleeve base layer. My only complaint with the FL was the sleeve length. At 6' and 135lb I'm at the extreme end of the bell curve and in small the FL sleeves were too short by an inch or more. When the Lightweight was released and said to be more fitted, I ordered a medium. Same features, but the cut isn't fitted: I'd call it a regular fit and it was just baggy (though the arms were just about right). If you're more normally proportioned I'd say go for it. You won't be disappointed. It's comfortable and cozy in a huge range of conditions and beats the Atom SL everywhere but wind resistance. I'll keep my fingers for a small/tall size.

Great jacket, I use it as a mid layer while skiing and just an everyday jacket. Do beware if you are a bigger guy or on the muscular side, it is a little snugger then say the Atom or normal proton, only notice a difference on my shoulders. No matter what I put it through it works awesome at regulating temps. It does run a little warm if you do give off a lot of heat so beware of that but it hasn’t been a huge issue for me.

Bought this jacket a couple of weeks ago. Super comfy and warn. Wearing it practically everyday. Perfect to use as a light jacket in the spring, summer and autumn, and as a mid layer in the winter. The jacket is not considered as a waterproof jacket (like a shell), however I was caught up in some light rain without an umbrella I was surprised to see that there is one water resistance (I didn't get home drenched).

I use this hoody during the winter and the summer months. It's a great base layer during the winter as its breathable material help regulate my temperature. The zipper pocket on the chest is one of my favorite features, making it easy to grab items on the go. It packs well when storing it in the pack and I absolutely love the elastic cuffs on the wrists! It's extremely comfortable as well.

I had the an older version in a medium size but needed to upsize due to to gaining some weight. I'm 5 feet 7 inches 190lbs and the large fits well and isn't too long, which was surprising given my smaller stature. The only issue I had was the new sleeve cuffs are a lot looser than the older version, which was tight but did the job of keeping the heat in.