Free Delivery on all worldwide orders over £150

Buy Now, Pay In 3 x 0% instalments with Klarna (£35+ UK ONLY)

Receive our latest news, releases & more - Sign up to the Brotherhood



Rated 4.94 out of 5 based on 66 customers 66 reviews
  • s
  • m
  • l
  • xl
  • xxl
Clear selection
No Stock - Get Update

Get Update

This product is currently unavailable. Please enter your email below and we'll send you an update once it's back in stock.

  • Worldwide free delivery on orders over £150
  • Buy now, pay later with Klarna (UK Only)
  • 30 Day no hassle exchange & Returns Policy

The SF Phalanx Fleece provides front line insulation. A mid-layer bolstered with POLARTEC® HIGH LOFT™  and POWERGRID™  technology.


The SF Thrudark Phalanx Fleece is a mid-layer designed to provide essential warmth for layering up in mid-low temperature environments.  The body’s natural warmth is contained in thermal air pockets constructed from precision knit, napped, and sheared polyester.  HIGHLOFT consists of hydrophobic yarns that repel moisture and speed dry times. This symmetrical design is not only soft, but also reduces surface friction for versatile layering options.  External hand and chest pockets provide stowage for mission essential items.  Phalanx formation – prepare to ADVANCE!


  • POLARTEC® HIGH LOFT™ insulation
  • Mid-low Warmth, Breathable
  • ThruDark Insignia patches compatible
  • Elasticated thumb loops
  • 2 YKK® zip chest pockets
  • 2 YKK®  hand pockets
  • Internal dump pockets
  • Weight of this garment is 575 grams (approx) this was based on a size Large


Please refer to fabric care instructions for particular garment care. If you should have any further queries about the care of your garment please send us an email to [email protected]

Find out about the latest ThruDark product developments here





Thermo Regen

Thermo Regen



Dynamic Movement

Dynamic Movement

4-way stretch

4-way stretch





Thermo Regen

Thermo Regen



Dynamic Movement

Dynamic Movement

4-way stretch

4-way stretch



and fabrics

Cut from a different cloth

card card



The body’s natural warmth is contained in thermal air pockets constructed from precision knit, napped, and sheared polyester. High Loft™ consists of hydrophobic yarns that repel moisture and speed dry times. This symmetrical design is not only soft, but also reduces surface friction for versatile layering options.

card card


HIGH LOFT™ technology

An irregular twist on a heavy fleece, providing extreme high warmth utilising Polartec® High Loft™ technology. Polartec® High Loft™ takes fleece comfort and thermal warmth to greater heights.

card card



Polartec® Power Grid™ is the evolution of fleece fabric engineering. Our patented grid construction knit strengthens performance efficiency by increasing warmth and breathability, while also reducing fabric mass. These geometric patterns improve compressibility, wicking, and add technical style.






Jay – Wears size Medium - Height: 177cm Weight: 85kg Chest: 40″ Waist: 32″ 32″

Louis – Wears size Large - Height 178cm Weight: 83kg Chest: 42″ Waist 31″ 31″

Staz – Wears size Small - Height 173cm Weight: 76kg Chest: 38″ Waist 28″ 30″

Dylan Hartley - Wears size XXL - Height: 185cm Weight: 110kg Chest: 48″ Waist: 38″ 32″

Foxy - Wears size XXL - Height 188cm Weight: 100kg Chest: 44″ Waist: 34″ 34″

Matt - Wears size XXL - Height: 188cm Weight: 90kg Chest: 46″ Waist: 34″ 36″

s m l xl xxl

Product reviews

Customer reviews and ratings

  1. Glenn Littlewood

    Another quality item from Thrudark, it’s like a big warm hug! It puts me in mind of my trusted helly hanson fleece (but even better) that saw me through a couple of Bosnian winters back in the 90s,

  2. Carmen Paul

    Wasn’t sure what to expect but received it today and must admit I like it. Light but warm. Quite form fitting and looks sleek.

  3. s_a_vaughan

    Extremely light, very warm, looks great. An outstanding mid-layer that will get lots of use.


  4. ciarandenning

    Incredible fleece. Very happy and would highly recommend. This was my second purchase from ThruDark, and if you thought the Recoil was good, the Phalanx is great and fully embodies their principles and stories. All I can say is thank you and I love it!

  5. Mathew Rolfe

    I am completely in love with this fleece! The Phalanx is far and away the best jacket of its kind I have ever bought and i have bought quite a few over the years. It feels incredibly warm, yet lightweight and, just like all Thrudark product, looks absolutely wicked. A proper triumph of form and function – get one in your life!

  6. danmoore40

    Lightweight,warm and really looks the part. Absolutely love this fleece !!!

  7. Anton

    Really great piece of kit. Perfect for Scandinavian spring weather. Using it as top layer at the moment but in colder weather I am convinced it makes an amazing mid layer too.

  8. Scott Davies

    Absolutely comfy well fitted fleece

  9. Scott Davies

    Very light, comfy and warm.. ?excellent for dark ops..!

  10. Mr M

    A very comfortable fleece that provides warmth to a high level for its weight . Trouble rarely comes with warning, but whatever Mother Nature has in store , these guys will have you prepared for it…

  11. Dan Hill

    Amazing. Lightweight, warm, fits well, quality product again from Thrudark.

  12. James Tibble

    This was an anniversary present from my wife(she’s amazing, I know) The Phalanx is up there with my favourite Thrudark items. My previous purchase was the Breach jacket and I love this just as much. Absolute quality as usual. Looks good, feels great and delivery was super fast. Thank you.

  13. James Tibble

    This was an anniversary present from my wife (she’s amazing, I know) The Phalanx is up there with my favourite Thrudark items. My previous purchase was the Breach jacket and I love this just as much. Absolute quality as usual. Looks good, feels great and delivery was super fast. Thank you.

  14. Ole-Andreas Thorp

    Without a doubt the best purchase I have ever made.

  15. Dale Murray

    Hands down the best garment I have worn, the small details are a nice touch to an amazing product.

  16. Gary g

    Great piece of kit very light very comfortable and looks good too! Used it today in the hills and it performed great kept just at the right temperature. Quality piece of kit would highly recommend

  17. Adrian Chubb

    Lightweight, seriously warm; proper comfortable. Another top class piece of kit from these guys.

  18. Howard

    Took delivery of my Phalanx Fleece just 24 hours after ordering it – that’s rapid!

    The fleece is fantastic and not like any other fleece I have owned! At 6’4” and 100+ kg the XL is a perfect fit and allows for layers underneath…

    Highly recommend this fleece – looks even better on than on the website!

    As I now own the fleece and the Breach Jacket my only problem is staying off the Thrudark website…

  19. Karl Merrett

    Sexy as Fack. Love it

  20. klausmichael

    Extremely comfy and warm. Looking forward to use it this fall/winter with my zodiac jacket
    The lads behind thrudark know how to make excellent gear

  21. steve.916

    Been waiting for re stock of this fleece. Arrived today perfect fit so light and very warm. Another great product to add to my expanding Thrudark wardrobe.

  22. Rachel T

    Absolutely love this fleece. It’s so warm – it’s going to be great in the winter.
    It’s lightweight and lovely and soft. So pleased I took the plunge and purchased it

  23. Aaron P

    This is one of many recent purchases from thrudark! As per it ticks all the boxes, customer service as always is on the money! Fleece is very light, however very cosy! You can feel the warmth soon as you put it on ?

  24. Russ

    Guys… what can I say great piece of kit .. where were you guys back in the day hahah
    Keep up the awesome work
    Russ from Iz

  25. Oliver Waters

    Amazing fleece. Tested it out in the woods. Weather constantly changing. Hot, cold, wind & then rain. Fleece was great. It folds to nothing & is easy to store. The quality is outstanding, as with all Thrudark’s gear. It’s a must have for those who need to keep warm, but also cool whilst being mobile in the elements. It fits brilliantly with my raid & zodiac jackets.

  26. Mark Richards

    Amazing bit of kit, very well made and extremely warm and durable. For outdoor activities and work this is an ideal item, which also comes with its own bag ideal for packing away in a day sack.

  27. Hainzy

    The Phalanx is an awesome fleece.

    It’s light weight yet robust, and it’s breathable and without sacrificing warmth. It makes a fantastic mid-layer, and an even better top layer on warmer/breezier days.

    Enough ample sized pockets to ensure you have everything you need at close proximity.

  28. John Cummings

    Just received my phalanx fleece.. Amazing piece of kit. Superior quality and a great fit .. worth every penny .. now for my next purchase ..

  29. Tony

    Superb fleece, with the quality that I’ve come to expect from the Thrudark team. Very warm, light and hard wearing. Great piece of kit to have in the back on the hills.

  30. t.maisonobe

    Best fleece i ever owned.
    It will follow me everywhere, any season.
    Extremely lightweight, and warm, so warm.
    Bonus: everyone wants to hug me in that thing.

  31. Steve Colwill

    Recieved mine last week and only worn locally due to lockdown but initial impressions are impeccable quality, lightweight and the fit and material are bang on. My only slight concern is the durability of the material but i can imagine the guys testing this kit have pushed it to some serious limits, time will tell but fair play guys what a piece.!! Service spot on too, other companies could learn a thing or two from Thrudark, cheers.

  32. Michael Hudson

    Very pleased with fleece. Warm, light and looks the part. Delivery was also rapid. Another quality item from Thrudark.

  33. Andy Guesy

    Don’t be put off with the “light” is!!, but the quality and fit is perfect, so comfortable and warm as a mid layer.
    Had mine about a week now with no regrets..

  34. David

    ‘The dogs dangly bits’

    Great quality, great fitting piece of kit
    I’m 6’ and 99kgs and the XL fits like a glove

  35. Joseph Mcginley

    Just arrived today. This is top quality and please be rest assured worth every penny. So much so that I am ordering another one When back in stock as just in case the production of this stops permanently. Please read the sizing charts as they give accurate sizing. Superb product and service yet again. Thanks guys.

  36. Joseph Mcginley

    Mix up in technology there and just to reinforce that this is a ‘5 star ‘ rating as my last post for some reason came up 3 which is def not the case

  37. Frenchy

    Very decent quality! definitely keeping me warm, would definitely recommend it!

  38. Mike W

    Had this a while and used it in a variety of settings. Really rate it – super comfortable, flexible and looks great. Highly recommended.

  39. Jamie Smith

    ⭐️⭐️⭐️⭐️⭐️⭐️Six stars from me, absolutely cracking fleece. I knew I was in for quality and fit for purpose, but It’s a G.O.A.T( greatest of all time, well you never know, there’s always someone) fleece, real warm, not bulky though, fits nicely under my SF Raid if required. Top of the pops definitely. XXL fits like a glove, 6’1”110kgs. ThruDark, real class, thank you 🔥🔥🔥🔥🔥🔥🇬🇧👍🏼

  40. Mike F

    Yet another quality item from the Thrudark line up. A great, warm mid layer for the cold days. I would add thought when worn on its own, due to the nature of polartec and the make up of the fleece it lets in the chill! But when used for what it is designed for it is faultless.

    Worn out the last two days in 0 and below with a shell over the top and its been awesome. Fantastic technical mid layer to add to your vault

  41. Andrew Henry

    Having done several tours of Norway with my trust worthy Helly Hansen fleece I have to say the SF PHALANX FLEECE is at another level lightweight, warm, durable and pockets in exactly the right position, I would recommend Thrudark clothing to anyone spending time in the outdoors

  42. PHIL

    Really solid piece of kit. Lightweight, warm but also keeps me cool on strenuous hill walks. I’m currently wearing this as an outer layer with one merino base layer underneath and it’s perfect in dry, windy conditions over the North York Moors.

    Quality and fit is excellent, can’t fault this at all and it looks like the donkeys doughnuts too, a real head turner.

    This is my first purchase from Thrudark (Christmas present from my wife), but I have a feeling this is the first of many.

  43. Dave

    Simply put, this is the best mid layer I own, giving seriously long standing brands a proper shoeing. My boiler broke during Christmas, thankfully mrs being a legend bought me this for Christmas, I was redders.

    The little details of this jumper are what make it really stand out, try it for yourself. You’ll never use anything else.

  44. Martin Foster

    With out doubt the best fleece I’ve ever owned. I’m 5ft 9 & 43inch chest XL fits perfectly.It may look light weight but trust me it will keep you warm & cosy.


    INCREDIBLE. I have had my eye on this for a while, so glad I made the purchase. Lightweight, incredibly warm and the intention to detail is first class. It looks the part and fits perfectly. You will not want to wear any other fleece. Just another class product from Thrudark.

  46. Keith Parmley

    I’ve had the Phalanx a few months now and It’s become the go to mid layer for all my recent hikes and outdoor adventures. My other options just don’t make it out the cupboard.

    The Phalanx simply put is an amazing bit of gear! Lightweight, warm, comfortable and excellent quality. It’s clear to see that a lot of time and effort has gone into it’s development.

    It took me a while to convince myself to buy due to it being more than I would usually spend on a mid layer but it’s so worth it. I would absolutely buy again and it definitely won’t be my last purchase from Thrudark!


    My recent purchase was the SF Phalanx fleece.
    Fantastic purchase, the quality is superb detail outstanding.
    It’s got a lightweight feel but holds the warmth inside.
    The best fleece I have purchased.

  48. Rita Nemcsenyi

    Absolutely loving it! Was way above my usual price range but after watching several mountaineers wearing it in harsh conditions I was convinced that this’ll be the perfect fleece for me.
    Super lightweight which makes it easy to pack when not worn, and when worn, oh my… Super toasty and makes Scottish winter seem like a joke. While doubled up with my denali fleece, the Phalanx kept me toasty in -10 weather on the continent. I think I just found my new best friend.

  49. Matt

    As expected another top piece of kit from the lads at Thrudark. Quality & fit is second to none.

  50. Tommo

    Its here!! the SF PHALANX FLEECE. Arrived this morning by DPD, mega fast delivery as all my previous orders. First impressions… what a good looking well-designed bit of kit, every part of this fleece screams quality. I am 6ft, just shy of 14 stone, broad shoulders, 33/34 waist, and the large size fits bang on. I have had several bits of kit over the years for my outdoor adventures and to be honest buy cheap buy twice!

    This for me is an investment to go along with my technical kit, yes some of you may say its expensive but, the quality, design, even down to the badges and zips are fantastic!! I will be wearing this now for the rest of the winterand when my other half sees this I will deffo be getting some sexy time!! great work guys bloody great hoofing kit.

  51. Owen Jones

    I have a few thrudark items now so thought I would try out this fleece , it’s awesome , i used to wear Harkila clothes for shooting but not any more , changing the full wardrobe for Thrudark 100% best in the business for any outdoor activities, excellent work guys 👊🏻🖤

  52. Tony Cohan

    Great purchase , wear it out walking the dogs , as a mid layer up the hills in winter it’s just so versatile and looks great.

  53. Ray Lowrie

    Great lightweight warm fleece, fits really well and fees super soft like a warm hug, really great full I received this as a Christmas present from my wife

  54. Joe Blakemore

    Quality product/ excellent fit/ super comfy , excellent customer service.

    5 *****

  55. Belly

    This bit of kit is awesome! I love the style Thrudark brings to the table keeping the functionality and durability at competitive prices.

  56. Andy C

    Just received the Phalanx Fleece – oh what a fantastic bit of kit! Valentines gift from the Mrs – Fits perfect, looks the nuts and super warm. The Mrs is so impressed she is ordering herself one too – bang on.
    Next on the order list is the recoil, well done Thrudark 👌👊 my wardrobe is about to be replaced 👍👍

  57. James pedler

    The phalanx fleece in XL is my second thrudark purchase after being extremely impressed by the quality of my sf engage jacket,I was a bit hesitant of the price but the reviews swung it for me and the reviews are spot on it’s light a great fit and great use of materials,fleeces are over looked for light synthetic jackets these days but a few classics always live on like the patagonia r2 or mountain hardware monkey man which both use polartec hight loft like the phalanx I have owned both those fleeces and more similar ones but the phalanx is really a cut above all of them,the quality and the sizing could not be better and the hood is awesome 4 pockets and polartec power grid for the side panels to give you full uninterrupted movement,I really can’t explain how good this jacket is it’s worth every penny and I’m certain this is going to be my go to jacket for climbing,hiking and everything else.
    Good job guys on creating a instant classic.

  58. Zachary Emerick

    At 6’3″ and 225 with broad shoulders this thing fits like a glove–snug where it should be, long enough, just right. I absolutely love it. It somehow seems to keep me at just the right temperature but when I’m too warm I just unzip and it’s just right. Been wearing this for about a month and 1/2 and it is my go to. I plan on getting more Thrudark kit as this stuff is excellent!!!

  59. Sam Wallace

    Outstanding bit of kit. Really well designed mid layer, I’ve had a couple mid layers in the past but this is by far the best one I’ve owned. Top work from the guys at Thrudark. I’ll be purchasing more from them
    In the future.

  60. Stephen barber

    Awsome bit of kit wouldn’t be without fleece I’ve ever owned.

  61. Martin P

    Once again like my previous purchases this Jacket is excellent, this will be part of my kit when I go to the Lakes next week. A great fit (large) and very comfortable, looks great alongside my Zodiac and Engage. Spot on guys.

  62. Jason P

    Hoofing bit of kit. Such good quality with superb attention to detail. Third bit of Thrudark kit purchased – all of which have been really impressive. The Phalanx is so versatile and sooo cosy!!

  63. David Labshere

    Literally one of the best pieces of kit I have EVER purchased! I spend a lot of time in outdoor apparel and this fleece is one of the most versatile and comfortable things I’ve ever owned. If you enjoy things outside you need this period! GO BUY IT!

  64. Michael Wilcock

    Just received my fleece and couldn’t wait to try it on.looks great,feels 6ft and 80kg and the medium is a perfect fit.bravo thrudark another awesome garment.

  65. machine hunter

    The reviews on this fleece are not wrong, Amazing quality and fits spot on and a great addition to my thrudark collection.Certainly worth every penny.

  66. Jack

    This was the first item I have purchased from ThruDark and the quality of this product gave me the confidence to buy more from the company.

    The fleece is lighter than it looks but is every bit as warm as advertised. Recently took it to the top of Snowdon with just a thin sports top undearneath and the Phalanx kept me warm throughout (even with a 1.5 hour wait at the summit – at ~3-5°C). Truly a quality product and easily my favourite piece of clothing that I own.

    Fit was perfect (as per the sizing guide) and it looks amazing.

    Would 100% reccommend the Phalanx to others. Great work by the ThruDark team!


Add a review

Your email address will not be published. Required fields are marked *