Mammut Broad Peak IN Hooded Jacket Review

20th Apr 2019

Mammut Broad Peak IN Hooded Jacket

I have a range of insulated jackets from thin through to really lofty and they all have their place.  However, it is certainly my thin to mid weight tops that see the most use.  Whether used as an outer layer on chilly days or as a mid layer when I combine them with a thicker top or shell - this weight seems to be versatile enough for a really broad range of activities and conditions.

Then, of course, there is the insulation type.  In colder drier conditions it is always down that I turn to first although, in damper conditions, synthetic usually ticks more boxes.  Down packs smallest and is super light for the level of insulation it offers, but it doesn’t fair so well when it gets damp (although this has been helped by the rise in availability of hydrophobic down).

Mammut recently sent me one of their new Broad Peak IN hooded jackets to test and this is one of those mid insulation level down tops that I really thought would suit a range of the situations I work and play in.  After a few months of almost daily use here is what I found......


The Broad Peak is a very well specced jacket with some interesting details.  The fabric used is Pertex Quantum which is a tightly woven structure of extremely fine yarns creating a light and soft drape fabric but, crucially, also allows the down to loft efficiently. Quantum offers excellent abrasion and water resistance.

The fabric also incorporates Y Fuse technology which is a series of tightly interwoven y shaped yarn filaments designed to improve both water resistance and down proofing (helping to prevent down leakage through the material). A DWR (durable water repellent) coating further enhancing water repellency and aiding the beading of moisture on the surface.

The Broad Peak is filled with 115 grams of 800 fill power 90/10 goose down to give a total weight for a size medium of 380 grams. Mammut only use responsibly sourced down for all their down products.   

Mammut have thought carefully about pockets and there are 2 harness compatible zipped hand pockets and a zipped chest pocket.  The jacket can be stowed in one of these side pockets.  Closure at the hem is via a drawcord that can be operated with one hand and stored inside the jacket to prevent a snag hazard.  Around the hood is a simple elasticated border which allows a snug fit and there are similar elasticated cuffs.  The front closure is a full length 2 way YKK Vislon zip with a chin guard for comfort.         

In Use

I have used the Broad Peak extensively over the winter and early spring.  This has been for everything from general everyday wear to carrying as a warm layer for various trips.  As mentioned, the jacket also accompanied for time spent skiing in the Alps, for 2 weeks ice climbing in Norway, on a mountaineering trip to Morocco and, as I write this, it is with me in the Nepalese Himalayas.

There are many ‘ultralight’ down jackets on the market nowadays and that’s with good reason.  They strike a perfect balance by allowing a reasonable level of insulation while keeping pack size small.  To stand out in this market you need to be offering something pretty special.  It is interesting to consider what stands out with the Broad Peak.

Firstly, I wouldn’t consider buying a down product nowadays that doesn’t come from a responsible and traceable source.  It is very easy for manufacturers to make this claim but please do check out the systems they have in place to ensure this is the case.  Mammut offer a lot of information about this on their website.  Please do have a read here.

Then, of course, it is important to consider the quality of the down used.  The down quality will have a direct bearing on both the longevity of the garment as well as the insulation level it offers.  The 90/10 mix used in the Broad Peak ensures a high quality mix offering an impressive 800 fill power.  This means, that for a jacket of this weight, it lofts really well and it also lofts quickly.  The air permeable Pertex helps with this, but it makes it perfect for when you want to pull a quick layer on at a belay stance or lunch stop.

It is a great ‘keep it in your pack for the chilly summit’ sized piece but I’ve also used it sometimes this winter as a mid layer piece under a shell on very chilly days working in Norway.  It has proved to be as versatile as I expected.

Pertex Quantum appears to be very thin and you wonder how it will hold up to the vigour of outdoor life.  Although you have to be careful with any thin material it has actually held up extremely well to general use and still looks as good as new after several months of very regular use.  I’m not going to be climbing gritstone in it, but if you look after it I see no reason it won’t cope with regular general use.

Mention should also be made of another feature of the fabric.  Pertex Quantum is a very silky and slippery fabric which means that the Broad Peak will slide easily over other garments and, in turn, other garments will slide easily over the top of the jacket.  This is significant as it makes the jacket seem to ‘float’ when you are wearing it as it can move easily over the other layers.  It feels great.

With typical Mammut efficiency, they have thought of all the details you need.  The zipped chest pocket is a good size and will store your phone, snacks or a compass.  Similarly, the zipped hand warmer pockets also work efficiently and, crucially for a technical jacket, they are placed out of the way of rucksack straps or a climbing harness. They are also a decent size and will store bulkier items like a pair of gloves or hat.  One pocket is also set up as a stow pocket - the jacket stuffs in snugly and that pocket has a 2 way zip for easy closure.

I like unfussy closures on jackets of this type and the simple elasticated cuffs are spot on. Similarly, the hood features the same elasticated beading and it fits snugly around the face.  It is worth noting that the hood’s sizing means it won’t easily fit over a helmet, but in Norway I used it a lot with my helmet over the top and found this worked really well.  This does, however, mean that you have to adjust your helmet each time and, indeed, that you have to remove your helmet to do this. It is a compromise but, overall, I feel this hood will suit most users most of the time.

At the waist there is a drawcord that can be operated one handed and can also be tucked away inside the jacket.  This is a great design that keeps everything neat and uncluttered.  Finally,  having a 2 way front zip is useful if you are using the jacket over a harness (I would really expect to mostly wear this under a harness though) or if you want to open it up to access things stored in inner pockets.


So,  it’s a wrap.  It should be clear from the info above that I really like the Mammut Broad Peak IN  Hooded jacket.  It is stylish, has all the features you need from a garment of this type, performs extremely well and has the usual Mammut attention to detail and meticulous construction.  It is a great ultralight down jacket.  Infact, the only negative I could throw at it is the price.  The Broad Peak retails for £269 and, while I think it will outperform many of the competition, that is still a lot more than some of those competitors.  Having said that, I do believe it is worth the money given the excellent construction quality and high performance materials - you will get a long and productive life from this product.  Full details on the Broad Peak can be found on the Mammut website here.

Posted by Paul