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Steep mixed terrain, long rock climbs, and other chilly alpine pursuits beg for the weather-shedding stretch of the Arc’teryx Men’s Gamma MX Hooded Softshell. The highly breathable, wind- and water-resistant Polartec Power Shield fabric and a light fleece lining give you the optimal mixture of warmth and protection when you’re on the go. A slightly longer cut and No-Lift underarm gussets keep the jacket from riding up while climbing, and the helmet-compatible hood lets you hunker down to ride out the storm.
Bottom Line: For mixed alpine conditions, the Gamma MX is where it’s at.
How does the fit of this compare to the Sigma AR? I have a Sigma AR in Large, and it is just about the right size, though a little too short. I am 6' 0" 175 lbs.
The Arc'teryx Gamma MX has a bit more length than the Sigma AR(I want to say about 1.5 inches)The large in this jacket will fit you really well, and it's a good deal more breathable,stretchy, and lighter than the Sigma. Enjoy!
As a longtime devotee of the Arc'teryx Gamma MX (I've been wearing them for 7 years) I'll give some insight to the new version. Fit is basically the same: athletic, long sleeves, fairly close torso. This new Gamma MX uses a new fabric that is a bit lighter, dries more quickly, and has a softer face. It maintains the old characteristics of being super durable (much more than you'd expect from a soft face fabric) lots of stretch, blocks about 90% of wind and very water resistant, while breathing much better than laminated soft shells. The Hooded version, which I prefer has a helmet compatible hood, with slightly less volume than the old one, which I consider an improvement. Have no fear, it's really an upgrade from the classic Arc'teryx Gamma MX of old!
How does this compare to the Arc'teryx Hercules hoody? I realize the Herc has a hi-loft interior, so should I expect it to be warmer than an MX? Does the MX compare to bc's Welder?
Some clarification on the previous reply about the Arc'teryx Hercules hoody vs. Gamma MX. The Hercules does have a DWR, and blocks about 60% of the wind. The Gamma MX is better as an outer layer due to weather resistance, but for mild conditions, the Hercules stands up. Hercules is cut to fit really well under hard shells, as insulation.
The Hercules is meant as a mid-layer insulation piece. It does not have the DWR treatment that softshell like the Gamma MX has, so will not be as wind/weather/water resistant. It's meant to be under a shell, so breathes really well and will work better as a layering piece under a shell than a softshell would.
When you layer a softshell underneath a hardshell neither breath properly as they're both meant as outer pieces.
But a piece like the Hercules underneath a hardshell will provide great warmth while being much more breathable when you're exerting.
I have a Hercules (and the lighter weight Griffon) that I use heavily for backcountry touring. They're great pieces for that because of how breathable they are making them great at dumping heat on the ascents. Because of their hard faced outer they shed snow and precip better than a traditional fleece or midlayer if you do drop your shell. They don't cut the wind very well though (you can blow right through them), so when it gets cold the shell comes back on. They make a much better part of a shell-based system than a softshell though.
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