This is truly a versatile jacket. I wore it comfortably while snowboarding in milder weather, close to 50F. It breathes beautifully. With a couple of baselayers (Under Armor cold gear and TNF Cirque Delta), and a 200 weight fleece vest, I wore it while snowboarding in 8F with wind chills at -25f. It is surprisingly warm for its weight. Additionally, I remained dry in a heavy, driving downpour. The DWR held up quite well, but I could tell the fabric was beginning to absorb some water. Two gripes: First, the sleeve cuffs should be adjustable. Second, the hood should have one more vertical adjustment to make it fit better when not wearing a helmet.

This is my first softshell jacket. What I like about this jacket is that it warmer than I thought. It looks good but others say it looks like a scuba suit. Very comfortable, full of mobility and very breathable. What I don’t like is the hood. It's too big. If you are planning to use this jacket with a helmet then it's perfect. The arms are kinda tight and layering might be a problem. Also the price. Other than that I like the jacket.

The lightweight Powershield fabric is a true workhorse in outdoor, high aerobic activities. While tackling peaks I have felt more comfortable than ever in this jacket. It easily manages the gallons of sweat I pump out on the uphill without a problem, while keeping me warm and comfy. I have yet to test it in extreme winter weather conditions, but in medium to heavy precipitation it shines like a diamond. The price is high, but what is top-notch comfort and protection worth?

the MX Hoody is great. its water resistant, wind resistant, light weight, not bulky and doesn’t restrict movement. cant wait to get out on the ice with it!

Functionally the jacket is great. Sizing for this particular softshell runs as the Arcteryx hardshells do—larger. My Gamma SV softshell fits great, the Gamma MX Hoody is almost too large on me. It’s great for adding lots of layers underneath, but it doesn’t have the slim cut of most softshells.

This was my first try of soft shell. Actually, I was looking for wind proof fleece jacket. This jacket is awesome! The stretch fabric doesn't disturb me, and gives me great warmth. But, sleeves are little bit tight, so I can't layer underneath this jacket. When I go to fishing, I wear Patagonia R2 vest. This combination is perfect!

This jacket is so resistant to bad weather that I was incredulously laughing last time I got into a blizzard and tested it to the end. It’s warm, light, very breathable, almost waterproof, wind resistant, and stylish. (I even went Atlantic sailing in the winter with it, but that was stupid—that shows how high my esteem for this jacket was!).

I got it never having heard of Arc'teryx before. It was the best investment I ever made, and now I almost exclusively buy from this brand.

By far the best jacket I have owned. It can stand everything: snow, rain and wind. I wore it snowboarding on a cold Park City day and later in the week it kept me warm while cross country skiing. For such a light jacket, I am amazed at how warm it keeps you. The hood fits perfectly over my helmet. I only use the hood on powder days, so its worked out well. This jacket has replaced both my fleece and my shell. I wear it all the time.

Very versatile jacket, my Gamma SV was often too warm, particularly skinning in the BC. The MX is great for most winter days and breathes really well. If it's super cold, just layer with a lightweight fleece. Arc'teryx stuff is expensive, but the fit is great for athletic builds.

Don’t think I can say anything negative about this jacket. Fantastic insulation and great fit. The fact that there are many ways to restrict the jacket makes it possible to wear it in strong winds without the hood being a nuisance - something I have tried with a number of other jackets.

Bill and I live in North Central Pa., and there are many ice climbing opportunities here. However, several of them require bushwacking. I originally ordered this jacket for Bill because of how it was described as being a helmet compatible ice climbing jacket. When I received it, it was not the substantial jacket that I knew it would need to be to stand up to the abuse it would receive. I exchanged it for the Sigma SV jacket, and I was glad that I did. The Sigma SV is thicker, has full length pit zips, and when drug across reaching branches...not a snag.

This jacket is truly the best jacket I have ever owned. I use it for everything; I love the look and the fit and the fact that it is not a popular jacket. It is great in all winter conditions. I don't know too many people with Arc'Teryx gear but it is the best company going. If you get the Gamma MX Hoody or any of their jackets, pants, etc., you will not be disappointed.

Not warm enough to wear without an outer layer in very cold weather. To tight (arms) to layer much underneath. Good to wear when temp is 40's walking or 30's more strenuous activity. Would be a great jacket and probably the one I’d reach for first if I could layer underneath more effectively.

Arc’teryx has hit the perfect balance with this jacket: thin enough to move with you, but blocks the wind just enough to keep you warm while staying breathable. The hood is large, but works very well with a helmet. If you're going to wear this around town, stick to the standard jacket. It's definitely an athletic cut, so don't expect to do much layering underneath.