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Luxury fabrics and revolutionary construction made for hard use in harsh alpine conditions.

What do you get when you fuse luxury fabrics and revolutionary construction from a company that likes to push forward the evolution of outdoor apparel and set new industry standards? You get the Arc'teryx Men's Fission SL Insulated Jacket, an incredibly lightweight yet durable waterproof, insulated jacket that has evolved to thrive under hard and prolonged use in the harshest alpine conditions. It is the lightest- weight waterproof, insulated jacket that Arc'teryx offers.

Arc'teryx engineered the jacket's NP40p-x face fabric to be incredibly durable and water-repellent while remaining extremely lightweight. It's laminated it to a Gore-Tex Pro fabric to create a highly breathable, lightweight, and durable waterproof fabric made for the most extreme conditions and use. Arc'teryx's Therma Tek insulation is treated with a DWR (durable water repellent) finish that keeps it from absorbing water if it's exposed to moisture. In an innovative construction process, the insulation is bonded to a tough nylon lining to create one consistent layer of warmth that leaves no cold spots that could otherwise be caused by insulation clumping. The jacket is sealed up by a high-tech watertight Vislon 2-way front zipper that keeps water out without the need for bulky storm flaps, and allows you to open the jacket from the top or bottom for easy access. One-handed drawcords at the hood and a drawcord at the hem allow you to cinch up, and the high collar on the hood, with soft brushed microsuede lining, provides full coverage to protect your neck and chin. Once you've battened down the hatches, you can always dump excess heat through the underarm zip vents. The hood is large enough to cover a ski or climbing helmet, and is designed to move with your head so you always maintain a full field of vision. The overall streamlined athletic fit and low-bulk profile of the jacket, along with anatomical shaping, articulated elbows, and underarm gussets, support agile movement so you're not restricted when you have to contort with ice picks to get to your destination. Large internal mesh pockets with wide top openings can hold your water bottle and supplies while zippered hand pockets hold smaller essentials as well as warm your hands.

  • N40p-X nylon and 2-layer Gore-Tex Pro
  • DWR-treated waterproof nylon Therma Tek insulation
  • Fully taped micro seams
  • Athletic fit (trimmer than a regular fit)
  • Insulated, helmet-compatible hood that cinches with one-handed drawcords
  • Watertight Vislon zipper and bottom hem drawcord
  • Zippered hand pockets and internal drop-in mesh pockets
  • Underarm zips

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Here's what others have to say...

What is the main difference between the fission sv and sl? is the sl just a little lighter? Is the sv or the sl warmer? Is one jacket trimmer compared to the other? The jackets main use is around town (Boston) so the most important features for me would be warmth and wind resistance. Features that would make climbing mountains easier would not play any factor in my decision. Reference i have a fission sv already, but was looking to get a new one after i lost some weight and noe it just fits way too big (was bigger to begin with to allow layering)

Best Answer

So the SL has less pockets and a not as thick face fabric. This all makes the SL lighter in weight and more packable but, less durable. If you like the SV but, have lost weight and it no longer fits, I would just grab a smaller size in that and try to sell your original SV.

You can call or email me directly. 801-736-6398, or

For skiing in 20 degree weather, is this jacket warm enough ? Under the coat, I wear three layers: t-shirt, light long sleeve top, and a medium weight long sleeve top. I currently have Arc'Teryx Kappa jacket, which is really comfortable for around town, but not super warm on mountain. The Fission is 2x the price of the Kappa and they are pretty close in weight, so I'm trying to better understand what exactly I'm getting for the extra $$$. Is Gore-Tex really that much warmer than non Gore-Tex (ie. 'windstopper')? Thank you.

This Fission SL will definitely be warm enough for 20 degree weather. Probably warm enough for -20 with the right layers!

The Fission SL and Kappa use different fabrics and different insulations. The Fission SL is completely waterproof and windproof. It also features pit zips which is quite nice when skiing inbounds or touring. Here's some information on Thermatek from the Arc'teryx website:

"Exclusive to Arc'teryx, Thermatek™ is a continuous filament, synthetic insulation that is treated with DWR (Durable Water Repellent) to make it hydrophobic, which means that it repels moisture very efficiently. The lofty insulation is then laminated to a backing fabric to ensure an even distribution and insulation.

-Arc'teryx's most efficient insulation when used in humid and wet conditions

-Very resilient and durable

-The fastest drying fill insulation in our collection"

You won't be disappointed with the Fission SL!

What is the center back length of a medium?

Is this too warm for walking around town in winter in northeast US? I recently bought the Atom AR and it's too thinly insulated. Is there one that's in-between? Thank you.

Best Answer

Absolutely not. The Fission SL Insulated Jacket makes for a great winter townie jacket as it's completely windproof, water proof and it features pit zips so you can regulate your body heat/temperature. I use one of these as a storm day ski piece and a winter townie jacket.


The one I'd choose

    If I had to choose 1 Arc'teryx piece to take with me into the frozen depths of hell, this would be it. The face fabric is Gore Pro, but very lightweight. The insulation is way too warm for most days, and it is synthetic so it'll perform well in the wet and damp. The features work well for utility but not fancy excess.

    I love the following:

    -Insulation(ThermaTek is amazing)

    -Deep mesh internal stow pockets

    -Fleece lined hand pockets with waterproof zippers and flap cover

    -Warm hood that'll make you sweat til you can't sweat no more

    -Pit Zips that won't suck up excess fabric due to hemmed insides.

    I would recomend this to the most tech specific mountain climber out there as well as the guy or gal that seems to always be freezing throughout the day of skiing, touring, winter camping.

    Thanks for the high praise. This jacket will more than meet my needs.


    fave arcteryx piece ever?

    • Familiarity:I've used it several times
    • Fit:True to size

    I have the 2013 model in cayenne XL (I am 6'5", 200 lbs) . The color and fit are fantastic and the build quality is bomber. I have been using it far more than expected in our "polar vortex" winter and it has held up quite well. Perfect for spectating CX races, winter hikes, and should do well for snowboarding on cold non-powder days.


    jacket is great but beware the color

    • Familiarity:I've used it several times
    • Fit:True to size

    The jacket is light and warm as it should. Just wear in town now and will bring it to more extreme environment.

    It fits great but a bit looser than last year's unisex model.

    Only complaint is the color although it's a pleasant surprise. I got Saguaro Green and it is more green than the picture.



    Canada. I checked before I ordered mine and just got it yesterday (Dec 2). Made in Canada.

    The new season 2014 version is made in China

    Typical. They get it made in China for half the cost and don't pass on ANY of the savings. Vote with your wallet I do.