The Complete Mammut Insulated Jackets Guide (2026)

Mammut make some of the best insulated jackets you can buy in the UK, and almost nobody outside climbing circles can tell you which one is which. The Swiss brand has been making alpine kit since 1862, the insulated range runs from £210 to £680, and the names give you nothing to work with. Taiss, Albula, Rime, Waymarker: none of them tells you whether the jacket is down or synthetic, a mountain piece or an everyday one, or where it sits in the range. That is the problem this guide solves.

I came to Mammut through the Aconcagua ML, the fleece I wear more than any other midlayer I own and the only one I have rated 5 out of 5. The build quality of that piece is what sent me digging through the rest of the range, and when I worked the whole UK market for our extreme-cold down jacket guide, a Mammut won it. This guide covers all eight insulated jackets Mammut currently sell, every spec verified against Mammut's own listings, and tells you which one fits your hiking.

Read the full review

The eight jackets at a glance

Warmth ratings are Mammut's own, on the 1 to 6 scale the brand publishes for every insulated piece. More on how to read that scale next, because it is more useful than most brands' vague warmth talk and it still does not tell the whole story on its own.

Down vs synthetic, and Mammut's warmth scale explained

Three of the eight jackets here have no down in them at all, or mix down with synthetic fill, and that split is the first decision to make.

Down gives more warmth for its weight than any synthetic, compresses smaller, and lasts for years if you look after it. Its weakness is water: wet down loses loft and stops insulating. Mammut's down jackets in this range run from 700 fill power (the Arctic, Glacier Glow and Waymarker) to 800 and 850 fill (the Broad Peak Pro, Taiss and Taiss Pro Belay), with the higher fill powers producing more loft per gram.

Synthetic fill keeps insulating when damp and dries fast, at the cost of more weight for the same warmth. In the drizzle, sea fog and drizzle-then-freeze cycles of a British winter, that trade is often the right one, which is why the Rime Pro Belay and Albula exist and why the two Taiss jackets place synthetic insulation exactly where down fails: shoulders and forearms, the zones crushed under pack straps where compressed down goes flat.

Mammut's warmth scale rates every insulated piece from 1 to 6. It is a within-brand comparison tool and a good one, but read it alongside fill weight, the actual grams of insulation inside the jacket. Five of the eight jackets here carry the same 5 out of 6 rating while ranging from 416g to 578g total weight and from £210 to £400, so the scale gets you to the right shelf and the fill weight, fill type and construction pick the jacket off it.

Full spec comparison

The whole range in one table. Tap a name to jump to the full write-up, or the buy button to check today's price.

Specs from Mammut's own listings for the men's versions at the time of writing. Check the listing for current pricing before purchasing.

Mammut Taiss Pro Belay IN Hooded: our top pick

This is the jacket that won our extreme-cold down jacket guide against the whole UK market, and the reasons hold just as firmly inside a single-brand guide. The Taiss Pro Belay is a belay jacket: the climbing pattern for the huge warm layer that goes on over everything else the moment you stop moving and your body stops making heat. Strip away the climbing and that is exactly the job a winter walker needs done at summit stops, lunch halts and long cold standstills.

The insulation is 200g of 850 fill DRY DOWN (90% white goose down, 10% feather) in boxwall chambers, so there are no stitch-through cold spots anywhere on the body. Then the clever part: the forearms and shoulders switch to 120g/m² synthetic insulation, because those are the zones that get crushed under pack straps and pressed against cold ground, and synthetic keeps working under compression where down goes flat. Total weight is 578g, the shell is a 10D Pertex Quantum Pro with Diamond Fuse and a PFC-free DWR, and Mammut rates it 5 out of 6 for warmth.

The details are all belay-pattern practicality. The hood is climbing-helmet compatible, which for a walker means it swallows any hat you own. The main zip is two-way, there is an internal neck gaiter sealing the collar, and the cut is the crucial bit: it is sized to be worn over everything you already have on, hardshell included, so it goes on in seconds at a freezing standstill and comes off in seconds when you move again. Sizes run S to XXL, with a women's version on its own cut.

The Arctic Parka below is warmer in absolute terms, but it is a 1400g expedition piece. The Taiss Pro Belay is the warmest jacket in this range you can realistically carry up a Brecon Beacons ridge in January, throw on at the trig point, and still justify owning the rest of the year. At £400 it is the pick of the whole lineup.

The Taiss Pro Belay in three colours

All £400 direct from Mammut. Tap a colour to go to that exact listing.

Black

Black / Glacier Blue

Mammut Red

Mammut Arctic IN Hooded Parka: the ultimate

If the question is simply which is the warmest thing Mammut sell here, this is the answer and it is not close. The Arctic IN Parka carries 390g of 700 fill down (80/20 duck down), nearly double the fill weight of anything else in the range, in boxwall chambers under a 2-layer ripstop shell. Total weight is 1400g. Mammut rates it 6 out of 6, the only jacket in this guide to hit the top of the scale, and classifies it as expedition kit.

Those numbers place it precisely. This is not a jacket for weighing against the others on grams or packability, because it loses every one of those contests on purpose. It is the answer for long, deep, stationary cold: polar trips, Arctic winters, extended time outdoors in conditions where a British hill jacket is not in the conversation. At £680 it is the most expensive piece in the range by a wide margin, and for the buyer whose cold is that serious, it is the once-and-done purchase.

For UK hiking it is more parka than the conditions will ever ask for. Buy it for the trip that demands it, not for the Beacons.

Mammut Taiss IN Hooded: the one you move in

The Taiss IN is the Pro Belay's mobile sibling, and the two make most sense read together. Where the Pro Belay is built to go on when you stop, the Taiss IN is built to stay on while you move: a hybrid running 110g of 850 fill down through the core with 80g/m² body-mapped synthetic at the forearms, shoulders and hood, the zones that take compression and moisture when you are working. At 345g under a 10D shell it is light enough to wear on the go without cooking you, and Mammut still rates it 5 out of 6 for warmth.

For a UK winter this is arguably the more useful purchase of the two Taiss jackets. A 345g hybrid earns its keep on cold South Downs mornings and Purbeck ridgelines all season, not just on the coldest days of the year. And conceptually the pairing is the complete cold-weather system: move in the Taiss IN, stop in the Taiss Pro Belay. If you are building winter kit in stages, this is the piece that works hardest between the big days.

At £350 it is £50 less than the Pro Belay, and choosing between them comes down to one question: do you need the jacket mostly while moving or mostly while stopped?

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The Taiss IN in three colours

All £350 direct from Mammut. Tap a colour for that exact listing.

Black

Glacier Blue

Autumn Larice

Mammut Broad Peak Pro IN Hooded: fast and light

The Broad Peak Pro is the range's fast-and-light slot: 150g of 800 fill DRY DOWN in a jacket totalling 416g under a 10D recycled shell, still carrying Mammut's 5 out of 6 warmth rating. Against the Taiss Pro Belay it gives up 50g of fill and takes 162g off the total weight, which is exactly the trade you want when the jacket lives in a pack all day and comes out at stops.

It is also the pure-down alternative to the two hybrid Taiss jackets. No synthetic zones, no belay oversizing, just a straightforward high-quality down jacket for the walker or alpinist who counts grams, moves quickly, and wants real warmth rather than a token layer. At £390 it sits £10 under the Pro Belay, so the choice between them is not about money: it is weight and packability against the Pro Belay's bigger fill, boxwall chambers and over-everything cut.

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The Broad Peak Pro in three colours

All £390 direct from Mammut. Tap a colour for that exact listing.

Black

Dark Mammut Red

Deep Teal

Mammut Rime Pro Belay IN Hooded: the wet-cold pick

The Rime Pro Belay is the same belay concept as our top pick, maximum warmth thrown on over everything at a standstill, insulated entirely with recycled polyester synthetic instead of down: 140g/m² through the body and 80g/m² in the hood, 547g all in, rated 5 out of 6 for warmth by Mammut.

The reason to choose it over the down jackets above is water. Down collapses when it gets wet and stops insulating. Synthetic keeps insulating damp, which makes the Rime Pro Belay the answer for the wet cold that defines most British winters: sleet on the Beacons, sea fog on a Dorset headland, the drizzle that never quite becomes rain but soaks everything anyway. If your coldest days are damp rather than dry, this is the jacket in the range built for them.

At £295 it is also the cheapest of Mammut's serious mountain pieces, £105 under the down Pro Belay. For a walker whose winters happen entirely in the UK, that is a strong argument for buying this one and keeping the change.

Mammut Glacier Glow IN Hooded: the value-warmth story

The Glacier Glow is the quiet bargain of the range, and the fill weight is the whole story. It carries 300g of 700 fill down (80/20 grey duck), which is a huge amount of insulation for £245: twice the fill weight of the Waymarker below, half again more than the £400 Taiss Pro Belay, and more down than anything in this guide except the £680 Arctic Parka. Total weight is 562g.

Mammut rates it 4 out of 6 on the warmth scale, below the mountain jackets, and the classification tells you how to read it: this is an everyday down jacket, not a technical alpine piece with a 10D shell and a helmet hood. What that 300g of down buys you is serious real-world warmth for cold commutes, winter dog walks, frosty mornings and low-level walking, at a price no technical jacket in the range approaches.

If you want the most warmth per pound Mammut sell and you are not heading up a mountain to get it, this is the pick. It is the jacket to point at when someone asks for a properly warm winter coat from a serious brand without a £400 spend.

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The Glacier Glow in two colours

Both £245 direct from Mammut. Tap a colour for that exact listing.

Black

Olive Green

Mammut Waymarker IN Hooded: the everyday packable down

The Waymarker is Mammut's entry in the most contested slot in outdoor clothing: the packable everyday down jacket at around £200. It runs 142g of 700 fill recycled down (80/20 grey duck) under a Pertex Quantum 50D recycled shell, weighs 456g, carries a 5 out of 6 warmth rating from Mammut, and sizes run S to XXL. At £210 it lands on exactly the same money as the jacket that defines the category, the Rab Microlight Alpine, which we covered in full in our Rab insulated jackets guide.

The comparison is close and worth making. Both are 700 fill down at £210. The Rab carries slightly more fill (153g against 142g) in a lighter 30D shell at around 425g total; the Waymarker's 50D shell is a notch burlier, at 31g more total weight. Neither choice is wrong. The Microlight Alpine has decades of refinement behind it; the Waymarker is the pick if you value the tougher shell, prefer Mammut's fit, or want the four colourways below.

For the walker who wants one packable down layer for cold dry days, travel and the daily routine, this is the sensible entry to Mammut's down range.

The Waymarker in four colours

All £210 direct from Mammut. Tap a colour for that exact listing.

Black

Mammut Red

Nebla

Marine

Mammut Albula IN Hooded: the everyday synthetic

The Albula is the accessible entry to the whole range: £210, insulated with 178g of recycled Ecodown synthetic fibres, 476g total, rated 3 out of 6 for warmth. It is the least warm jacket in this guide by Mammut's own scale, and that is the correct spec for what it is: a three-season everyday insulated jacket rather than a deep-winter one.

The case for it over the same-priced Waymarker is the case for synthetic generally. Ecodown fibres keep insulating when damp, shrug off the drizzle that would worry a down jacket, and make the Albula the easy-care option: the jacket you wear without thinking about it, wash without specialist down cleaner, and lend to whoever forgot a coat. For commuting, school runs, low-level walks and changeable British weather, that easygoing character is the whole point.

Choose the Waymarker for maximum warmth and packability at £210. Choose the Albula for the jacket that does not care about rain and does not need looking after.

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The Albula in three colours

All £210 direct from Mammut. Tap a colour for that exact listing.

Black

Dark Red

Marine

Why buying direct from Mammut matters

A habit worth breaking: treating a marketplace as the default place to buy outdoor kit. For a jacket at this level, buying direct from Mammut has real advantages.

Full size runs and current colours. Mammut's own store carries the complete size range and the current season's colourways, including every colour panel in this guide. Third-party listings tend to hold fragments of last season, which is how you end up compromising on fit for a jacket whose entire job depends on fit.

The maker's own warranty and aftercare. A £400 down jacket should be a decade-long relationship. Buying direct puts you inside Mammut's own warranty and repair channel with no argument about where the jacket came from.

No third-party-seller roulette. Marketplace listings can be fulfilled by anyone. Buying direct means the jacket comes from the people who made it, at the maker's own price. Every link in this guide goes to the exact listing on Mammut's UK store.

Which one should you choose?

For most serious UK walkers the answer is the Taiss Pro Belay. The belay format is the right format for the coldest moments of a winter day, the 200g of 850 fill down in boxwall chambers is the strongest warmth story in the range short of the expedition parka, and the synthetic shoulders solve the compression problem every pure-down jacket has. It won our extreme-cold guide against the whole market and it wins here.

If your winter jacket spends more time on your back than in your pack, buy the Taiss IN instead: same fill quality, hybrid construction built for movement, £50 less. Together the two make a complete system, and if you are buying one now and one later, start with whichever matches how you actually walk.

Counting grams, buy the Broad Peak Pro IN. Walking through a wet British winter rather than a dry Alpine one, buy the Rime Pro Belay and let the synthetic fill do what down cannot. And if warmth is the only question and the budget stretches, the Arctic IN Parka is the ultimate answer: 6 out of 6, expedition class, and warmer than anything else on this page.

Below the mountain tier, the map is simple. The Glacier Glow is the warmth-per-pound pick: 300g of down for £245 is the strongest value in the range, in an everyday jacket rather than a technical one. The Waymarker is the packable everyday down and the direct rival to the Rab Microlight Alpine at the same £210. The Albula is the easy-care synthetic entry point for anyone whose weather, or patience for down care, argues against feathers.

Whichever you land on, the quality argument holds across the range. The Aconcagua fleece that first sold me on this brand is still the best midlayer I own, and the insulated lineup is specified with the same seriousness.

Frequently asked questions