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(The Gear Loop) - When the cold bites, very little can compete with a classic insulated down jacket, whether that’s one stuffed with the plumage of ducks and geese or fashioned from a slightly more vegan-friendly synthetic texture.

Designed to be worn as a mid-layer, with perhaps a T-shirt or warm base layer beneath (depending on your intended use and destination), what the humble puffer lacks in waterproofness, it more than makes up for with pure, unadulterated heat. Ask anyone who has conquered the North or South Poles and they will swear by an insulated down jacket for its life-supporting abilities.


Favoured by hikers, campers and winter sports enthusiasts, there tends to be an insulated jacket for most outdoor pursuits, with those more sports-specific numbers packing features that benefit the pursuit you plan to use it for, such as Alpine climbing or winter sports.

With that in mind, we’ve collated and tested a selection of our favourite insulated down jackets, all of which are lightweight, can generally be packed into tiny stuff packs and are incredibly warm, acting as the perfect companion for drier winter walks or as a vital layer when out on the slopes or climbing mountains.

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Most of the jackets feature real duck or goose down (although some go for synthetic options), with many opting for a recycled version that’s kinder to the environment, while others have signed up or created various programmes that ensure the down comes from ethical sources. In general, most of the down is located around the core and vital organs, with synthetic textiles used for those more susceptible high impact areas, like the shoulders.

Wherever insulation is mentioned, it’s difficult to escape fill power numbers and in general, the higher the figure, the better quality of insulation used and the warmer the jacket will be. Fill is the internationally recognised measurement of how well down will "loft". This is basically the amount of space one ounce of down will occupy - or in other words, how fluffy it is. The higher the number, the fluffier and better quality the down.

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Another term frequently used is baffles, and this refers to the stitched panels inside which the down resides and these can be mapped in a number of ways in order to promote greater flexibility for climbing or skiing, or cover more of the body for greater warmth.

Every jacket manufacturer is different and will tempt buyers with numerous technologies that are said to favour particularly activities or promote unique features. We’ve picked a fine selection that cover a broad range of activities and cover a number of price points, so you can ultimately decide what’s best for you.

The best insulated down jackets

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Klättermusen Loke 2.0



  • Great fit
  • Reinforced shoulders and more
  • Amazing warmth to weight ratio


  • Very pricey
  • Hoodie-style entry not the easiest

Designed with Alpine climbing in mind, the revised Loke from extreme condition experts Klättermusen offers a fantastically packable option for any cold conditions. Weighing just 474g in a men’s medium, it’s superbly light weight and can be stuffed into a rucksack (or even folded into its own pocket) so it barely takes up any space.

It is filled with RDS-certified White Goose Down with a Fill Power off 800+, which gives it an amazing warmth to weight ratio. But what impressed us most was the fit, as it promotes great freedom of movement and essentially disappears when thrown over a lightweight fleece or thermal layer.

There are plenty of clever Klättermusen details too, including the slanted chin fastening, which keeps buttons away from the mouth and chin when fully buttoned up, as well as the mitten-friendly hem and cuff adjustments.

It’s pricey, but then every element on the jacket is reinforced and cleverly conceived, all designed to withstand the rigours of Alpine pursuits. But for us, it makes a super winter coat that can be thrown over anything when the cold bites.

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ThruDark Engage Jacket


  • Rip stop and water resistant outer
  • Tough as old boots
  • Primaloft synthetic down is toasty


  • Muted colour palette
  • Heavier than some rivals

ThruDark has selected only the best materials for its Engage Jacket - a synthetic down number that’s not quite as hardcore as some of its true mountaineering gear but is instead meant to traverse shoulder seasons without proving too bulky or overly warm.

Pertex Quantum Pro is chosen for the outer, offering water resistance, while still proving lightweight and breathable enough that you won’t melt into a sweaty mess when active. 

Primaloft Gold Active+ synthetic down has been used in abundance, meaning the jacket offers excellent heat-trapping properties without making it feel too bulky or heavy when worn. There’s also reinforced areas around the shoulders for those who romp with backpacks and a clever shaped storm hood with peak and drawcords for an improved fit.

It’s a highly technical jacket and arguably one of the warmest we’ve had on test so far, but the muted colour ways fly in the face of convention when it comes to retina-singeing outdoors wear, opting more for a covert approach. But that’s the ThruDark way.

£375 | Buy now from ThruDark

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Rab Infinity Microlight Down Jacket



  • Super light
  • Comfortable to wear
  • Surprisingly warm 


  • Very difficult to fault

One of the best-selling all-round down jackets, this lightweight, breathable and multi-faceted 700FP down number from Rab is fantastic for stomping around damp forests or acting as a warm but breathable layer when out on the mountains.

It uses Gore-Tex Infinium Windstopper fabric on the outer, meaning it offers superb weather and wind resistance, while remaining exceptionally light and comfortable to wear. The zoned micro and nano baffles, filled with recycled down, are mapped in a way to move with the body when hiking and climbing. The plumage is also coated in Nikwax to ensure it doesn’t become sodden and useless with a bit of snow or rainfall. 

We found the fit to be superb, with superior stretch in the fabrics to ensure the jacket moves with you. It’s also unfathomably light and soft, plus the clever elasticated wrists make it easy to slip over bulky gloves or quickly check a watch.  

Better still, it stuffs down into its own small stack when the temperature rises, meaning you can slide it into the back of a backpack or even shove it into a pocket of a pair of walking trousers. In our opinion, this felt like one of the best value, all-rounder jackets on test here.

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Highlander Lewis Insulated Jacket



  • Fantastic price
  • Packs down small
  • Helmet compatible hood


  • Not the most stylish
  • Lacks water-proofing

Not everyone wants to spend a small fortune on an insulated jacket, only to be presented with Spline-inspired elements that they rarely use. This no-frills option from Highlander packs a fantastic warmth to weight ratio and is designed to be stuffed into a bag and called upon when the temperature drops.

Thanks to its fully synthetic TECLOFT insulation, it’s possible to throw it in the wash when it gets dirty, although that nylon shell will need treating with a hydrophobic spray or wash if you want to make the most of weather-proofing properties.

We thought the fit was great, promoting plenty of freedom of movement, while the elasticated cuffs ensure the sleeves stay in place. There are also plenty of pockets for keeping valuables safe, from the zipped front pockets to the two velcro inner stash points. 

After donning jackets from ThruDark, 66 North and Klättermusen, it certainly lacks a bit of wow factor. But that’s not the point here, this represents exceptional value for money, yet it’s a hard working jacket that can be used all year round. 

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66 North Vatnajökull


  • Made from recycled materials
  • Versatile wear
  • Nice spread of colour options


  • Comes up small
  • Tough to fit layers beneath

The Vatnajökull is designed to be a versatile winter jacket, able to slide under more robust outers for extremely cold adventures or worn as your sole barrier against the chill, cold breezes and light rainfall.

As such, it is cut more like a mid-layer, which meant the medium came up very sung on us, making it tricky to slide a thicker fleece or jumper underneath.

It is made from 100 per cent recycled polyester for exceptional eco credentials and the Polartec Power Fill synthetic down is also most recycled, but also proving warm and light. We found it to be nicely breathable too, making it possible to regulate body temperature neatly when picking up the pace on a hike.

Exceptionally well put together, much like most 66 North gear, it’s hardy enough, although we couldn’t help noticing it didn’t pack the same kind of Alpine expedition details and reinforcements of Klättermusen or ThruDark garments. 

£250 | Buy now from 66 North

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The North Face 50/50 Down Jacket



  • A great layering option
  • Awesome flexibility for snow sports


  • Expensive
  • Hood isn’t the warmest

And now for something a little different: the 50/50 jacket from ultra-stylish mountain experts The North Face is ultimately designed for the slopes and is intended to be worn as part of a system with other Steep Series layers TNF offers.

That said, it makes a fantastic mid-layer or lightweight general winter coat for anyone wanting something featherweight and thin to wear under a waterproof layer, yet one that is packed with the warmest 800-fill ProDown. Said down is carefully positioned around the body and vital organs, with a super stretchy raglan sleeve, helmet compatible hood and thumb loops proving the last word in stability and mobility for busting big airs on the mountainside.

We didn’t get anywhere near a terrain park during our time with the jacket, but found ourselves reaching for it on numerous occasions, purely because it offers exceptional levels of warmth and weatherproofing without the added bulk of some of the jacket on test here. Granted, it’s arguably not the final word in outer layers and with that in mind, it feels expensive. But it is an extremely versatile mid-layer nonetheless.

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Fjällräven Expedition Pack Down Jacket



  • Classic looks
  • Packs into its own pocket
  • Warm and light


  • Boxy fit
  • Limited pockets

If you were to ask this jacket to perform its party trick, it would quickly and efficiently pack itself into its own inside pocket. Slightly freaky, but even more amazing is how much quality, 100 per cent traceable down Fjällräven has managed to squeeze into a jacket that weighs just 415g when specified in a medium size.

Like many jackets on test here, it places synthetic over the shoulders and at other pinch points to improve longevity, something you’ll be keen on after parting with £255 for a coat. Part of the Fjällräven’s much lauded Expedition series, the jacket draws on nearly 50 years of experience in extreme cold conditions and oozes quality. For example, there is an easy access elasticated hem and securing toggles, so you can pull it tight to prevent cold gusts blowing up your midriff - something much aped by other brands. 

It is also super lightweight, but the fit is quite classic and boxy compared to the more athletic cuts of the Rab and The North Face. On top of this, it only has three pockets - two for the hands and an inside number that doubles up as a stuff bag. This isn’t a dealbreaker, but filling those deep pockets with keys and other items spoils the cut of the jacket and items tumble around a lot.    

The jacket on test was the basic Pack Down model, but there is a hooded variant that costs an additional £20, but offers vital protection to the head if you get caught in a storm. We also think it looks ace and it comes in a fetching new Deep Forest green. 

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Mountain Equipment Lightline Jacket



  • Furnace-like warmth
  • Packed with tech features
  • Ace hood


  • Not great as a mid-layer
  • Fitted cut, not great for bulky underlayers

One of the beefiest jackets on test, this proper puffer crams 296g of 90/10 Pure Down (with a fill power of 700) into the larger size jackets, yet still manages to be ultra-lightweight and pack down small enough to cram into the top of a backpack.

Designed to be all the jacket you really need, rather than merely an insulating mid layer, the Lightline uses a Drilite Loft outer, which is a tough, windproof and highly water-resistant Nylon textile with a bespoke coating that provides a hydrostatic head of 1500mm to keep the insulation dry in hostile environments. Great for drizzly winter days and superb for keeping the down dry. 

On top of this, the hood has a wired peak, so you can adjust it to sit back and out of the way when not needed, or pull it down (and it stays in place) when the wind and adverse weather starts whipping up. Or, if you don’t want a hod in the way, you can easily zip it off and stash it away.

A number of the jackets on test feature a collar that’s lined with a soft, almost fleece-like fabric, which improves comfort dramatically but also traps warm breath when zipped up over the face to keep the mouth and nose toasty when it gets really cold.

The zips are of excellent quality and we never experienced any snagging or jamming when using it, the only slight downside is that it’s slightly bulkier than the other models we tested, so arguably not quite as good for climbing or other high excursion activities. Plus, sticking a thick wooly jumper underneath does limit movement a little, so be wise with your layering. 

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Forclaz MT900 Trekking Down Jacket



  • Great price
  • Stylish 
  • Performs like a champ


  • Not hugely waterproof
  • Bulkier than rivals 

Part of Decathlon’s top tier hiking and trekking range, the Forclaz MT900, like so many of Decathlon’s modern products, represents fantastic value for money. Available in Whale Grey (as tested here) or Carbon Grey, it’s an 85% down/15% feather-filled beast with a near-700 fill power rating. 

It has been tested (not by us, we should add) to handle temperatures of -18°C with a base layer and mid-layer fleece also in place, or in other words, it will happily tackle the worst of the winter weather with just a t-shirt or light jumper worn beneath it. 

For the price, it’s a fantastic outer jacket that’s most definitely bulkier than most of the rivals on this list but more than makes up for it with warmth and a decent amount of weather-proofing to boot. We also liked the under arm zips, great for promoting air circulation in the sweatiest areas, as well as the elasticated storm toggles at the hem and on the hood.

It fits well too, with an athletic cut and cleverly designed elongated cuffs that shroud a watch or glove without the need to constantly move elastic about. The YKK zips are reliable and the rope toggles are all really easy to access and use, even with gloved hands. 

Out of all the jackets here, this one drew some of the most positive comments on the way it looks and the most surprised mumbles when we mentioned where it was from. The downside? It’s probably not the most mobile for really intense sports or activities.

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Patagonia Macro Puff Hoody



  • Super light and easy to pack
  • Storm flap zipper
  • Hand-warmer pockets


  • Synthetic down not as warm
  • Very expensive

Patagonia opts for 100 per cent recycled polyester, high-loft PlumaFill insulation over the traditional duck or goose down and it believes it is not only kinder to the planet but also performs much better when wet.

The jacket is clearly designed with hardcore climbers and mountaineers in mind, because it is festooned with clever and often difficult-to-spot features. The hood, for example, is designed in such a way that it will happily slip over an alpine helmet, with a superb aperture that increases field of view while keeping its wearer protected from snowstorms.

Patagonia is also generous with the pockets, as this Macro Puff Hoody offers two welted hand-warmer pockets, one external left-chest zippered pocket and two large, internal drop-in pockets with elasticised edges that we found were great for keeping maps and other gadgets safe.

Although extremely lightweight, the jacket fits well and has plenty of comfort features that make it easier to wear over extended periods of time. The front zip, for example, has what Patagonia refers to as a "garage" at the chin to avoid any rubbing or chafing.

This is a mighty expensive jacket but like the majority of Patagonia’s kit, has been tested and used by professionals on far more extreme conditions that most buyers will ever face. We found it made an excellent mid-layer or a very lightweight option for those who don't like hiking with the bulk.

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Montane Men's Axis Alpha Down Jacket



  • Fantastically warm
  • A huge array of tech on offer
  • Performs admirably as an outer


  • You’ll pay for the privilege
  • Limited number of pockets

Many brands harp on about how their products are "athlete tested" or shoved in a wind tunnel or set on fire. Ok, maybe not the latter, but the point remains the same: there’s a lot of marketing guff with very little to back it up.

Montane is different, because its products have been extensively tested, actually frozen solid in a cold chamber and worn in the most extreme environments on earth by professional athletes. Its Axis Alpha jacket is the result of such extensive research and it really shows. 

Firstly, the fit is excellent, figure-hugging in all the right place but allowing for plenty of movement for things like scrambling and climbing. 

Secondly, the list of technologies featured here is beyond extensive: body-mapped insulation comes courtesy of Gore-Tex Infinium, Pertex Air and Polartec Alpha Direct. All used in different areas to promote warmth, moisture wicking and heat regulation.

The down core is water-resistant, while the exterior is also very well shielded from precipitation. Plus, the use of synthetic insulation in the arms, back and hood means it’s a surprisingly hardy thing too.

We’ve worn this as a mid-layer and rocked it as a main outer and it has performed every time, fending off the worst of the Welsh weather and keeping us toasty warm on sub-zero wild camping nights on Dartmoor.

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What to look for when buying an insulated jacket

Check the fill quality

As previously mentioned, down and other insulated products (like sleeping bags) will come with a Fill Power (FP) number and this refers to how much space an ounce of the fluffy stuff will take up. The higher the number, generally the better the quality of down and the warmer you are going to be. Anything over 700 is at the premium end of the market and will incur an additional cost, but you’ll be so toasty it likely won’t matter.

Think about weather-proofing 

Insulated jackets aren’t particularly storm-proof and if you get caught in an almighty deluge, it’s likely the performance of the internal down is going to be compromised if it gets damp. Certain manufacturers have combatted this with the use of innovative outer textiles, ensuring they offer some water-proofing while remaining breathable. Alternatively, look for jackets that come from the factory with a durable water repellent (DWR) coating. It’s also possible to purchase bespoke products, like Nikwax Down Wash Direct, which covers the jacket in an invisible layer of waterproof protection and can easily be applied at home.

Consider your activities 

If the jacket is simply for chilly winter walks, then most of the models we’ve mentioned here will perform perfectly well. However, the more adventurous among you might be thinking of climbing, speed-hiking or performing all manner of high intensity winter sports. If that’s the case, you’ll like want an insulated jacket that acts as a flexible mid-layer, keeping the body warm yet not impeding mobility. If this is the case, you’ll want to pair it with a waterproof outer layer, too.

Get the lowdown on the down

Consumer trends have shifted of late, with more buyers understandably concerned where the textiles they are buying come from and the environmental impact they have. Most of the top manufacturers now use responsibly sourced down, with unique tracking numbers in each jacket allowing the buyer to see exactly where the down has come from. What’s more, the use of recycled down takes things one step further, removing waste from landfill and putting it to good use. 

Writing by Leon Poultney.