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Filoment Hoody [Mens] Hydrophobic hooded down jacket

Filoment jacket - Light and packable 650 fill power hooded down jacket with Downtek hydrophobic down 


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  • Jaffa - Filoment jacket - Light and packable 650 fill power hooded down jacket with Downtek hydrophobic down 

Filoment Hoody [Mens] Hydrophobic hooded down jacket

Incredibly light and packable 650 fill power hydrophobic down jacket, a warm mid-layer or top layer for Alpine starts and chilly evenings


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  • Full Description
  • Features At A Glance
  • Care & Environmental Advice
  • Size Guide
  • Customer Reviews

The sun is slipping below the mountain horizon as you start up the last pitch of the day, or maybe you’re trying to keep your load as light and compact as possible as you race across the dragon’s back. 

Filoment is our most packable insulated jacket. It’s designed for active use, so it doesn’t get in the way on the technical bits and is versatile enough to fit into your layering system. 

Narrow micro baffles give the Filoment an active, slim fit. It has a dropped, adjustable hem at the back and articulated arms that stop it from riding up when you’re reaching for that next hold or bending over to fit your snowshoes. The insulated zip baffle, chin guard and under-helmet hood keeps you well-defended against the cold.

Filoment also has two zipped hand warmer pockets, internal dump pockets and an external chest pocket for your phone, keys, and other valuables.

The outer fabric is a light yet durable 40gsm nylon with a DWR coating, well equipped to handle the demands of active use. The responsibly sourced 650FP down fill gives an excellent weight ratio. It’s also hydrophobic, so it retains loft in damp conditions and recovers better too.

Incredibly packable and light, Filoment is a staff favourite. We’ve worn ours on evenings around camp, Alpine starts, and even as part of our sleep systems on ambitiously minimalist mountain marathons.


DownTek-treated down absorbs less water than untreated down. This means it retains its loft better in damp or humid conditions, dries quicker, and recovers better too, keeping you warmer in damp environments than untreated down. DownTek is environmentally safe - Bluesign approved, PFC, PFOA, and PFOS free – and uses only RDS certified down sources. Remember, it's better not to get your down wet – even water repellent down is no substitute for a waterproof shell!  


We use only RDS certified down; all our down is audited by a third party to ensure that it comes from birds who are not live-plucked, force-fed, or mistreated. That’s good to know. 

Key features
  • Spot on for layering up with low-bulk micro baffles and low-profile elasticated cuffs
  • Made for moving in: long back, articulated arms and under-helmet hood
  • Zip baffle, chin guard and drawcord adjustable hem keeps out the draughts
  • 2 hand pockets, 2 internal ‘dump’ pockets, and external chest pocket
  • Very small packed size (fits in a 1 litre dry bag)
  • Hydrophobic down and DWR coating for resilience in damp and humid conditions
  • 3 Year Alpine Bond
Vital stats
Weight (total/fill)

S: 310/124 g; M: 335/132 g; L: 360/140 g; XL: 390/148 g; XXL: 400/156 g 


Fill: 90/10 European duck down, RDS certified, Downtek Water Repellent 
Fill Power: IDFB 650 
Main Fabric: 100% nylon; 20 d mini ripstop nylon, 40 gsm 
Lining: 100% nylon, 20 d, 36 gsm 
Construction: Stitch-Thru 

Environmental Considerations

The chemical finish that keeps water beading off your jacket has changed. 
As with all garments from responsible outdoor brands, our DWR treated garments meet international environmental standards and require occasional washing with a technical wash to maintain their high breathability. 
This wasn’t always the case. Years ago, garments were treated with chemicals that had toxic by-products that lingered in the environment for generations. Those old chemicals needed little maintenance, whereas modern waterproofs need regular washing. 
We fully support this change. In fact, we quite like the idea of taking time to look after our kit so that it lasts a long time. 
We are committed to reducing the environmental impact of all our products –in fact it’s in our DNA: we can’t imagine ever doing anything else. We always review the materials we use, manufacturing methods and our own consumption of resources. We do the research, make informed decisions, and choose the best option available to us.

Product Care Information

You can and should wash this garment, most active outdoor folk do this once or twice a year.

Washing and re-waterproofing flushes out the dirt and oils that have accumulated so that it puffs up nicely and works better in damp conditions

Don’t panic! Down is surprisingly durable and washing is not an onerous task. You can wash it in a front loading washing machine with our detailed instructions (see the FAQs).

Size chart Down Jackets Mens
Men's down jacket sizing chart
Chest (inches) 37" 40" 43" 46" 49"
Waist (inches) 30" 32" 34" 36" 38"
This size chart indicates the body measurements our garments are designed to fit. Measure yourself as described below, and use the size chart to find your size.
Chest: measure around your chest at the widest part. The tape measure should pass under your arms, and be level from front to back.
Waist: measure around your waist at the narrowest part.
Hips: standing with your feet together, measure around your hips at the widest part.
What You Say: Customer Reviews and Comments

3 Reviews


Used this product?

Write a review
Great in the alpine cold

Been using this jacket (jaffa) since November. Really impressed with how warm, light and packable it is.
Used on NYE for an overnight bivvy and it kept the cold out. Just used it in the Alps for 4 days of good weather skiing. Combined with a Craft thermal and merino mid-layer, I was incredibly warm even when the wind whipped up whilst sitting on chair lifts. Recommended without a doubt!

Simon the Scot
Great versatile jacket

I’m an estate worker, dog walker and coffee drinker!

The jacket has been superb during the very cold mornings this week, with the hood helping keep ears and head warm. Ideal as well at lunch time when I brew up and cool down a bit.

The short hand written note in the packaging was a nice little personal touch. I’ve bought gear from Alpkit before, and I’ll be back again!

Great packable jacket

I've owned this cozy down jacket for well over a year now and I'm very pleased. It packs down very small given that it has a hood and it's not intended to be extremely minimalist and it's very warm. It still has DWR so quite handy for quick dashes in and out of the tent in bad weather. Great!

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