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  • Mammut - Masao Jacket - Men's -
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  • Mammut - Masao Jacket - Men's -

Mammut Masao Jacket - Men's

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7 Reviews


For rainy days on the mountain.

The lightweight Mammut Men's Masao Jacket is the perfect choice for mixed or ice climbing, backpacking, and classical alpinism trips when the weather is uncertain. DryTech Premium and fully taped seams ensure excellent waterproof and windproof protection that's also highly breathable to keep your hard-working body comfortable. Underarm zippers offer supreme airflow and ventilation, and the two-way adjustable hood slides over helmets with ease. Mammut pre-shaped the sleeves for unimpeded mobility, and added hook-and-loop straps at the cuffs and a drawcord at the hem for a snug fit. The zippered hand pockets are always accessible even with a harness or backpack on, there are pockets inside the jacket for valuables, electronics, and snacks.

  • DryTech Premium membrane (3-layer)
  • Underarm zippers
  • Two-way adjustable, helmet-compatible hood
  • Preshaped sleeves with hook-and-loop cuffs
  • Drawcord hem
  • Two zippered harness- and pack-compatible hand pockets
  • Internal mesh, media, and zippered pockets
  • Item #MAM001R

Tech Specs

[membrane/laminate] DryTech Premium (3-layer), [shell] polyester, [lining] polyurethane
Fabric Waterproof Rating
15,000 mm
Fabric Breathability Rating
15,000 g/m²
preshaped elbows
yes, helmet-compatible, 2-way adjustable
underarm zips
[external] 2 harness- and pack-compatible handwarmer, 1 zippered chest, [internal] 1 stretch mesh, 1 media, 1 zippered
fully taped
Claimed Weight
1.04 lb
Recommended Use
backpacking, alpine climbing, mixed and ice climbing
Manufacturer Warranty

Tech Specs

  • Reviews
  • Q & A

What do you think about this product?

Have questions about this product?

Mammut Masao.........Get it..........!

  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Size Bought: XXL

Had the older version. Bombproof but with extremely minor zipper issues. Have Newer version. Zipper a bit better. This is a great 4 season shell and for the $$ a lot of jacket.....Has quite a few bells and whistles and the weight is still minimal in your pack. Completely waterproof.....tested in the rainy and cold Adirondacks........I'm of the belief they broke the mold on this technology. Tried newer technology and came back to this. Maybe not quite as breathable as newer shells but it will stand up to Trees in the glades in winter and bushwacking the forest in summer rain........Oh yeah, Mammut is very,very good about taking care of their product issues as well........Highly recommended in every aspect.........Kato..........

great jacket

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

Love this jacket. It moves with you so it doesn't feel like you are wearing a jacket. It is form-fitting so I was worried that I could not wear my Mammut Eigerjcoch down under it. Surprise-it fits over my down jacket without constricting movement or looking "puffy." Hood fits well also.

Fit, fabric, style and bang for the buck

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Large

For $300 this seems like a great buy. Mammut quality is really high as expected and fabric is stretch and seems really tough. Fit is great and not too tight, not too baggy. Great pockets including the inside mesh pockets, one of them is perfect for my smartphone. Hood works great and fits over a helmet just about perfectly. Really can't find a thing to complain about.

This is it!

  • Familiarity: I've used it several times
  • Fit: Runs small
  • Size Bought: Large

Solid Jacket. After looking at a bunch of other jackets, this is by far my favorite. Great waterproofing, Took it into the shower to test it. No leak, not even a drop. Great fitting jacket for an average build. It fits true to size/slightly smaller. I would say if you look at arcteryx or marmot jackets it runs smaller than those but its still a great fit. Less extra fabric where you don't need it. Im a medium in nearly everything but I got a large in this so i could layer a heaver down underneath. the medium fit but it was snug in the shoulders.

When I've skied in it it was fine. kept the wind off me well after a long climb up.

If you don't want to spend the money on a more expensive shell, this is it. The waterproofing is excellent, construction is great. Its all the performance and quality and quite a bit cheaper. No looking back. I like it as much as an old beta ar I had. Id choose this equally to that.

Quality! Dump water all day on this!!!!!

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: Large

I'm 6' 145lbs Large fits primo! DRYtech Is unbelievable!! Had my bro take 750ml's of water and drench me and the water just FELL OFF??? DRYtech is very breathable and super durable aside from being duck feathers!!!!! A+ I Love this shell for ice climbing/ skiing/ and catastrophic winds!!! Mammut your the bizz!!

Love it

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: large

You could go swimming with this on and you wouldn't get wet. Very comfortable with material is very durable and is pretty breathable for a shell. Plenty of room to layer underneath and the pockets are big and easy to use with a harness or pack on making it a good climbing or backpacking jacket. Its also good as an outer layer for snowboarding but it doesn't have a snow-skirt so its not the best for that. The only thing I don't like is the main zipper, it is on the opposite side of a normal zipper and is really easy to get misaligned and get the zipper stuck. It just takes a little time to get used to but other than that its a great jacket.

Great hard shell

  • Familiarity: I've put it through the wringer
  • Fit: True to size

I use this primarily bought this for skiing on our occasional East coast rainy winter days. I have also used it days where only a light mid layer is needed. Breathability is great and overheating has never been an issue. As far as being a hard shell, the water resistance is fantastic, even in the heaviest of rain.

For use as a skiing shell, I find it's great. It's very comfortable, performs really well, and due to it's light weight, flex and fit, I barely feel I'm wearing a jacket. The hood is claimed to be helmet compatible, and although it's definitely bigger than a non-helmet compatible hood, I find it doesn't really fit a ski helmet well. It fits over it, but restricts head movement too much (at least for the downhill runs). This may be because it wasn't specifically designed for use with a ski helmet. It's also possible Mammut updated the design, as I've had my Masao jacket for 2 years now.

As far as fit, like so many of Mammut designs, it's definitely a snug fit. I did not size up and would not have wanted to. Although snug, it does not feel too tight. The fabric has some stretch to it, which just makes this a great piece for active use. On the other hand, as much as I love this hard shell for skiing, for every day use I prefer a soft shell with a more casual fit. For example, the collar of the Masao is great at keeping you dry out in the elements, but can be a bit in the way if you're wearing it on a long commute to the office.

I only have one minor complaint and that's with the arrangement of the external zippered chest pocket and internal mesh media pocket. The chest pocket would be better if it was just a little bit bigger, but the real unfortunately thing is that it stacks directly on top of the internal media pocket. The interior pocket perfectly holds a phone and also allows routing of a cable to your helmet/headset. However, because of the way these pockets are stacked it's not comfortable to wear with a phone in the media pocket and anything much more than a driver's license, credit cards and some cash in the outside chest pocket. It's not a major problem, but it would have been a better design if Mammut had not placed these two pockets the same side of the jacket.

Unanswered Question

How is wearing the hood without a helmet? Most of the time I won't be needing a helmet and am worried that there will be a bunch of extra material that will sag in my eyes. Can anyone show a picture of the hood on without a helmet?

Are the pictures true to color? does anyone have a picture of the "space" color?