Mammut Lanin Jacket

Mammut Lanin Jacket using  GORE-TEX Active fabrics

The biggest challenge for me as an individual who creates a decent amount of perspiration while playing hard in the outdoors is staying dry, not only on the outside, but from within. I've been wanting to get my hands on a jacket made with GORE-TEX Active membrane as it is one of most breathable waterproof/breathable materials on the market.

For those not familiar with the differences between the two main GORE-TEX membranes used in high end apparel, fear not! GORE-TEX Active is the most breathable fabric made by Gore and does so by using a lighter and thinner membrane while using a new lamination technique to bond the liner side of the jacket directly to the membrane. But why does this make for a more breathable jacket? For those science folks here is the reason. The diffusion rate of  Fluoropolymers, in this case ePTFE (GORE-TEX),  is inversely proportional to the thickness of the membrane.1 For example, if we have two jackets both using the same membrane, but one of the two jackets has a slightly thicker membrane, than the jacket with the thinner membrane will breath better.

GORE-TEX Pro is the most durable membrane made by Gore and that is done by using a heavier denier face fabric ( minimum 40) and two thin membranes sandwiched between a slightly different PTFE mid layer. Gore also backs the Pro shell with a special " Micro Grid Backer technology for high internal abrasion and snag resistance"

I've been eyeing several jackets from different manufactures that use GORE-TEX Active fabrics and ultimately kept the Mammut Lanin jacket. I really wanted one jacket meant for aerobic activity like ski touring while also being able to use it for backpacking and hiking. The Lanin has two front pockets and a sliding two way front zipper. All the zippers are Spray proof YKK zippers. One critique of the jacket is that the main zipper isn't a YKK VISLON zipper which is not only easier to use but more durable.

Front face of jacket. Two front pockets and a front two way zipper
The Lanin jacket has light weight powder skirt (1.3 oz)  for skiing which also zips offs when not needed.

Upclose view of powder skirt
Unlike many jackets using Active fabrics, the Lannin also has pit zips. I won't go into the pit zip debate, some love them like I do, while others think they just as extra weight.  The hood is easy to use and is helmet compatible.

Pit Zips
Helmet compatible


My first impression with the jacket was at Stevens Pass Resort with lift and back-country skiing.I was using a single piece merino/synthetic blend base layer with the Lanin jacket on top and an insulated bibs for bottoms. I was able to ski aggressively on piste and throw my skis on my back and hike 15-20 minutes to get access to back-country  terrain without ever needing to unzip the jacket or the pit zips. Even breaking trail among the fresh 8" of snow to skin back to the resort resulted without any unzipping. Temperature was around high 20's F with light wind.

The powder skirt worked flawlessly as a few unfortunate events resulted with my skis above me instead of below me! Overall I think Mammut hit a home-run with the Lanin Jacket. 13.76 oz, including the removable powder skirt, pit zips, and a two way front zipper for those with more vertical endeavors in mind. The few recommendations to Mammut would be to add a small microfiber area around the chin area for addition comfort and to use a VISLON Aquaguard zipper like Arc'teryx's Alpha FL.

For those comparing different jackets using Active fabrics, I picked the Lanin over the Alpha FL from Arc'teryx $399 ( lack of two way zipper, hand pockets, powder skirt, and pit zips) the Axiom Jacket from OR $375 (no two way zipper, pit zips, powder skirt). MSRP for Mammut's Lanin jacket is $399 and sizing is pretty snug, I am 5'10" and 165 and use a large so I have room for insulation and/or an avalanche transceiver. For all the features the Lanin jacket packs, the closest competitor's jacket was the Loften from Norrøna, but MSRP is $499.

Overall, very impressed! Absolutely love the Mammut Lanin jacket and Active fabric by Gore!


Good powder day at Stevens Pass!






1 http://www.crp.co.uk/technical.aspx?page=199

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