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Out of stock - Montane Men's Flux Jacket

Out of stock

Lightweight warmth for the cooler seasons, without the bulk.

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Product code: 15904599 / 323981

Lightweight warmth for the cooler seasons, without the bulk.

The Men's Flux Jacket combines a clever construction with a wide array of useful mountaineering features.

Made from 100% recycled PERTEX® QUANTUM ECO fabric, with Primaloft® SILVER ECO insulation and PEAQ Synthetic ECO lining, the jacket is fully showerproof, completely windproof, fast drying, comfortable and locks in warmth excellently. The result is a jacket of the utmost reliability, with every consideration made to comfort and practicality.

The features are superb. The helmet-compatible hood is wire-peaked and fully adjustable, with added insulation for when you're out on longer or colder days. 

Two deep A-line handwarmer pockets ensure that your hands are kept warm when they're not gripping the rocks or poles, and then there's an internal mesh pocket for gloves and water bottles, with two further chest pockets.

The YKK VISLON® and AQUAGUARD zips are waterproof (the former including a stormflap) and resistant to ice, and there are ergonomic pulls for use with gloves and mitts.

With numerous adjustable features to personalise the fit and keep out the elements, and articulated arms for fluid, light motion, the Flux is an excellent example of a mountaineering jacket.

It even folds into its own pocket and has a carabiner loop for when it's not needed.

  • Articulated arms with engineered tailoring
  • Slightly larger chest and bicep dimensions allow for winter layering
  • Fully adjustable roll-away insulated climbing helmet compatible hood with stiffened peak
  • Full-length two-way YKK® VISLON front zip with internal storm flap
  • Two deep A-line handwarmer pockets with fine microfleece lining
  • Two zipped chest pockets
  • Internal left hand mesh pocket for glove and water bottle storage
  • Stuffs into right hand pocket with internal carabiner loop for when not in use
  • YKK AQUAGUARD® VISLON® zips for use in icy conditions
  • Easy grab ergonomic grippy pulls for use with gloves or mitts
  • Shaped cuffs and adjustable hook and loop tabs
  • Adjustable hem with two-sided cinchable drawcord
View Clearance
Primaloft Silver Eco
Insulated, Packable, Water Resistant, Waterproof, Wind Resistant, Windproof
Hidden Pockets, Outer Chest Pocket
Full Zip
Stiffened Peak, Fixed, Helmet Compatible, Roll Away

This product qualifies for the following delivery methods

Standard Delivery (3-5 Days) (FREE)


Once despatched you will receive updates from the courier.

Reserve and Collect (within an hour) (FREE)


We will notify you when your order is ready to collect.

Click and Collect (3-5 Days) (FREE)


You will be notified when your order is ready to collect.

AM Delivery (£7.95)


Order by 8pm and get your item delivered to you by 12pm the next working day (Not available for NI, Channel Islands or Highlands)

Standard Large Delivery (3-5 Days) (FREE)


Standard Large Delivery (3-5 Days) (£200.00)


Express 2 Day Delivery (£5.95)


Express delivery takes 2 working days when order is placed before 1pm Monday-Friday. Once despatched you will receive updates from the courier.

Bike Delivery (£4.95)


Bike delivery is £4.95. This applies to all bikes, and these orders are upgraded to a DHL courier service.

British Forces Post Office (BFPO) (FREE)


Delivery before 10:30am (£8.95)


Saturday Delivery (order by 6pm Friday) (£5.95)


Click and Collect Next Day (order by 6pm Mon - Fri) (£2.95)



Returning orders to us is easy. Whatever your reason, we offer a refund or exchange within 28 days of delivery or collection.

Chest 36 38 40 42 44 46
Waist 28 30 32 34 36 38
Inside leg (R)  
30 30.5 31 31.5 32.25 33
Inside leg (S)  
28 28.5 29 29.75 30.25 31
Inside leg (L)  
32 32.5 33 33.75 34.25 34.75
Chest 92 97 102 107 112 117
Waist 71 76 81 86 91 96
Inside leg (R)  
76 77.5 79 80.5 82 83.5
Inside leg (S)  
71 72.5 74 75.5 77 78.5
Inside leg (L)  
81 82.5 84 85.5 87 88.5

Ratings & Reviews

Overall Rating

4.73 out of 5
15 reviews
Write a review
4.73 out of 5

Great jacket

The jacket looks good and is warm, like other similar types it is only suitable in light rain. I am pleased with my purchase.

4.73 out of 5

Made to a price

Firstly before I start I have to say that I am a massive fan of Montane jackets this being my fourth and second Flux. My first Flux, which I ripped on a wall was a great jacket, large enough to get layers under with massive pockets for all my stuff. The new Flux is made so much smaller,although it is the same marked size with pockets just about big enough to get your hands in but nothing else. It really feels like they have made it to a budget. I moved to Montane after Berghaus and The North Face did the same, profit over product. I'll now have to find a new manufacturer as this jacket is useless for me and my son will get a jacket to walk to work in and I'll go back to my old ripped Flux.

4.73 out of 5

Awesome Insulated Jacket!

Montane have clearly put a lot of thought into the design of every aspect of this jacket. With Primaloft insulation it's particularly suited to typical UK wet winter conditions. It's warm, windproof, highly water resistant and is more practical day-to-day than a down jacket, as you don't have to worry if it gets damp. I really like the fit of the jacket and the four external pockets are really useful. I use it for everything from winter lunch stops on a mountain, to cold weather hiking and wandering round the shops in town.

4.73 out of 5

Great light weight jacket

Well worth the money paid

4.73 out of 5

Superb jacket

Lightweight, very warm insulated jacket. Ample pockets.

4.73 out of 5

Great Belay Jacket

My second Montane jacket- great product. Fits well (but get a size larger than you might normally get if like me you want to use it as a top layer when winter climbing).
Really well constructed, dries out really fast, it is very light and packs down really small. Totally recommend it.

4.73 out of 5

Wonderful UK jacket

I must have bought one of the first Flux jackets and I have worn it to death! It's the only gear I would definitely pack for October to may in the UK. In a Scottish winter, I find so many jackets are too warm when climbing or ski mountaineering. With a merino base layer, the flux is just perfect on top. It keeps out the cold wind and yet with all zips open is fine in most conditions. I'm just looking for another! I climb mountains for a living.

4.73 out of 5

Montane jacket

Super lite but still keeps you warm. Great wind protection. Packs up small. Great for holidays.

4.73 out of 5

Fantastic insulated jacket

Bought a Flux a few years ago and it's travelled with me all over the place around the UK and beyond. It's not the warmest insulated jacket out there but feature-wise and fit-wise it's pretty perfect. It's been stashed in packs, had packs on it, been climbed in, scrambled in and walked in both in Summer and Winter. What I really like is the resilience of the outer fabric which is excellent. Of course the insulation level and type isn't the same as expensive and heavier weight jackets. But it has an array of pockets (harness friendly too). (Maybe too many pockets but hey, good to have options). The fit is slightly articulated but with a lot of room too (I'm an athletic medium and this isn't a fully athletic fit). There's a slightly wired peak and a great hood that can be stashed away. I don't bother stuffing into a pocket, it lives in a dry bag in the pack. Doesn't look too shabby around town if that helps anyone. Has all the features needed in a lightweight insulated jacket. Without a thick baselayer it wouldn't be my go-to for Scottish winter but its range is so wide and it works in so many places, I can't recommend it highly enough. Oh yeas and zipper pulls are workable with gloves on in winter. Last two things - it's not a 'ski jacket' (Go Outdoors website, Aug 31 2018). Nor is it waterproof as one reviewer says. It's water resistant. But keeps a relative amount of warmth when wet too. Cannot recommend highly enough. My go-to jacket for years!

4.73 out of 5

Super product

This is a super light and very warm jacket. Have worn it in temperatures of 0 to +2 degrees with only a base layer . I was going to buy a more expensive jacket, but pleased I didn't

4.73 out of 5


A light and super warm jacket. With a great hood. A perfect jacket for staying warm while out in winter. I am very pleased with this jacket.

4.73 out of 5

Montane flux jacket

Jacket is very light and comfortable. Only have worn it on a very cold and windy day along the beach with a thin shirt underneath. Was warm and cosy. Ample pockets, more than other jackets. Recommended.

4.73 out of 5

Montane excellence

Looking for a great warm functional jacket then look no further. I had originally planned to buy something much cheaper but after trying this jacket on, I was sold. Warm cosy and with plenty of adjustment to the wrists, waist and the hood, I love this jacket. I normally cannot get coats to fit me.Technical details set this above its rivals. The weather hasn't really turned to test this jacket to its fullest. But it kept me warm with just a t-shirt underneath during the recent ex ophilia storm.

4.73 out of 5

Montane flux jacket

Fantastic jacket for hiking, warm and waterproof, very tight when trying to pack it into its own pocket

4.73 out of 5

Montane Flux - Fantastic warm jacket

I always wonder, why all this good quality stuff from the british island is just that underrepresented here in continental germany.
Always pride of my ultra durable Berghaus Rucksack, now after >30 years R.I.P., holding the ingenious belt buckle for a second life.
Then I discovered Montane, first shirts, light and fast drying and had a look at there product line.
Now I own some Montane Mittens, soft basecamp shoes, a cap, a winter hat, all from that high performance but extra light Pertex material plus Primaloft insulation. 
Best to be compactly packed in hand luggage only travels.

Also I added the Prism sleeping bag in olive from montane despite the fact that I already have two others (Lestra down and a hollowfibre) - because I liked the waterrepellency and the build quality too.
Am I a gear junkie?

When I saw the Flux jacket advertised on GO, this was my chance to jump on it.

I ordered XL, since I am that 'big beer belly' man, just 178cm tall but 36 inch jeans weast. It fits well with different underlayers but with extended arm slieves in length as it was expected. This is not a problem at all since I wrap the slieves around to the inside and fix it with velcro. Adds extra insulation (same I do with the outer hardshell from Columbia (OutDry) in XL if needed in heavy rainfall).

Tested the Montane Flux Jacket right yesterday in october on mount Etna, in Sicily, about >2000 meters above sea level. Approved. Stamp-on-it.

Very warm around the freezing point, if not too warm. In a drizzle the DWR holds up, but when the shower came up, I added the hardshell to be secure. 
Nice head shield, with extra Montane Cap underneath, of course :-)

When work-out in high activity it can become wet on the inside, which is usual and I could never find a way around, then leave it off then or let it dry up later on, which goes fast, based on the material. There seems to be no 100% breath-able material existing on earth (other then our skin), so this one goes as far as it goes.

Compression, when not in use, inside its own pocket is OK, but could be better with an extra vaccuumizing deflating packsack which I think of DIY-ing.

The look is awesome, not as much as that aggressive one like on the inside lining, alarming red colour, but that could be thought of being the second function: wear it inside-out as a call for rescue signal when everything goes wrong out into the montanas.

Overall, I really like this stuff.
Spot me on flight CTA-TXL.

Jason (nickname)

from Germany, Berlin, Wilmersdorf,
this was 'the british sector' from since Jalta to 1990 Thatcher's Time :-)

Found a lower price online? We'll beat it by 10%