A lightweight, insulated jacket is cut from four-way stretch Fortius 2.0™ fabric for enhanced breathability and mobility, while a low-profile StormHood™ completes the action-ready design.
Front zip closure
Stand collar; helmet-compatible hood
Elastic cuffs
Chest zip pockets; vertical side-zip pockets
Drawcord-toggle hem
Durable water-repellent (DWR) finish
60-denier stretch soft shell nylon plain weave face with 233 g/m² polyester fleece backing
84% nylon, 16% elastane
Machine wash, tumble dry
Imported
Item #10999227
Core Product ID 3333332KL5
Size info
The brand says this runs true to size.
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With a name inspired by the first reptile to sprout feathers for flight, it's no surprise Arc'teryx is all about creating outdoor clothing and gear that allow users to perform at the point of extreme need. Its innovative, highly technical outerwear protects against the elements while ensuring ease of motion for an optimal outdoor experience.
Love the jacket. It’s my daily for shoulder season in BC, Canada. I like the warmth you get from the fleece liner yet it’s not big and bulky like a puffy jacket. Had it down to 2 degrees Celsius in Whistler and was warm enough when walking with just a t shirt underneath.
RJONES
Reposted from arcteryx.com
Most helpful critical review
Feb 22, 2026
Why did you ruin a perfect color with those pocket
I’ve been waiting for a decent blue-grey Gamma MX for seasons. Finally, the "Dk Stratus" color looks amazing on the Jacket version. But why, for the love of design, did you add those bright blue contrast pockets to the Hoody?
The Jacket is sleek and monochromatic, while the Hoody looks like a DIY patchwork project. The contrast is jarring and cheapens the aesthetic of an otherwise high-end piece. We buy Arc'teryx for the minimalism and technical look, not for random pops of color that don't match. Please, give us a monochromatic Hoody option. This was a massive swing and a miss.
YanZ
Reposted from arcteryx.com
arcteryx.com response
Hello YanZ, thank you for taking the time to share this with us. Your feedback on the Dk Stratus Gamma MX Hoody is genuinely appreciated. We’re glad the Jacket version hit the mark for you, and we understand how the contrast pocketing on the Hoody can feel out of step with the clean, monochromatic aesthetic many of our guests look for. The design team explored a more expressive color-blocked approach this season, but we can see that this direction didn’t resonate with everyone. Input like yours is incredibly valuable as we plan future colorways, and we’ll be sure to pass this along so the desire for a fully tonal option is heard.
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5 stars55%
4 stars17%
3 stars11%
2 stars13%
1 star4%
Pros:
Cons:
Oct 27, 2026
Gamma MX Hoody
Love the jacket. It’s my daily for shoulder season in BC, Canada. I like the warmth you get from the fleece liner yet it’s not big and bulky like a puffy jacket. Had it down to 2 degrees Celsius in Whistler and was warm enough when walking with just a t shirt underneath.
Reposted from arcteryx.com
RJONES
Oct 22, 2026
Perfect Fit
This is the best jacket I ever owned. It's hard to find a jacket that fits me and this one is perfect. It is not waterproof but I wear it in the rain and I stay absolutely dry.
Reposted from arcteryx.com
Justin
Oct 10, 2026
Great casual jacket
Great casual windbreaker in mist and light rain environments. If it had pit zips I’d consider it more for activities, but as is more of an apres or walk to work piece of gear unless you ice climb.
Reposted from arcteryx.com
Mikey
Sept 24, 2026
This is the perfect jacket for Fall chilly day!
The fit of this jacket is absolutely perfect for me! I appreciate the longer sleeve length, as it provides excellent coverage for my arms when I stretch. The fabric feels great—soft yet durable. The weather-resistant feature is fantastic for rainy days; I love seeing the water droplets bead up on the surface of the jacket. Additionally, the fleece lining keeps me warm during chilly fall mornings. Overall, this jacket is exactly what I need, and I would recommend it to everyone!
Reposted from arcteryx.com
LeiZ
Sept 9, 2026
Work Gamma MX review
I'm a wildland firefighter. We got the Gamma MX as a crew work jacket for its weather resistance and its durability. First day on the line it rained not heavily but sustained through the whole day. My shoulders got a bit soaked through but i stayed warm. So far it is holding up and very tough considering the abuse ive already put mine through. I do recommend the coat.
Reposted from arcteryx.com
Beaeli
Sept 3, 2026
Great piece
Good quality, nice design and provides great wind and sun protection when out on water. Fairly light weight, but still provides good warmth.
Reposted from arcteryx.com
Sirocco
Aug 31, 2026
Gamma MX
Excellent softshell with a great balance of weather resistance, breathability and comfort. The fit works well over a Proton LT and Kyanite Hoody without restricting movement, and it also layers under a hardshell when conditions deteriorate. The fabric feels durable and provides effective wind protection while remaining comfortable during active use.
My only minor criticism is that the body length is slightly shorter than expected compared to the Proton LT, but overall the fit and performance are excellent. A versatile piece for hillwalking, scrambling and everyday outdoor use.
Reposted from arcteryx.com
Scottish
Aug 20, 2026
Cuffs Ruin It
The jacket itself is great, however the cuffs are terrible. I had to return it due to the cuffs. I’ll buy it again the second they put some nice adjustable velcro cuffs on this jacket.
Reposted from arcteryx.com
arcteryx.com response
Hello John B, thank you for taking the time to share your feedback on the Gamma MX Hoody. We’re glad to hear the jacket itself worked well for you, and we appreciate you calling out how the cuff design impacted your experience. The non‑adjustable cuffs are intended to keep the silhouette streamlined, but we understand how important customizable wrist closure can be for comfort and layering. Your perspective is valuable, and we’ll be sure to pass it along to our product team as they continue to evaluate future iterations.
John B
July 18, 2026
Greatest softshell jacket ever
Great jacket, I use it often. I climb and hike. This jacket is perfect for the Colorado Rocky's and it's changing weather.
Reposted from arcteryx.com
Phil
July 12, 2026
I like this jacket with two color.
Comfortable, weather resistance, stretch too, I like this style
Reposted from arcteryx.com
Xuyên Quach
June 1, 2026
Great product
Outstanding product, I picked this up somewhat unexpectedly after it was recommended for me by someone in store. This jacket does not disappoint, it’s durable comfortable super functional and has a great fit. I think most people would be better off buying this jacket instead of the atom lt. I’ve worn it for 3 seasons and it works well even on warm evening. It’s not waterproof but will keep you dry enough, good on windy evenings. Initially I had thought it would be better with a smooth sleeve liner for better layering over a fleece but after wearing it with a tshirt I don’t think I’d change a thing anymore. Exceptional product and probably the jacket most people should buy. Though expensive I’d buy again in a heartbeat even at full price. I am 6’4” 190lbs and the large has a perfect fit for me, sleeves are long enough and the body has some room for layering without being boxy feeling, I also really like the cuffs
Reposted from arcteryx.com
Carbb
May 31, 2026
Awesome
The jacket is awesome! It is warm when you’re wearing a long sleeve shirt underneath it and it fits like a glove. I was out with a little bit of misty rain and did not get wet through the jacket. I wouldn’t trade it for any other jacket.