Yukon Down Jacket: K Series

'K Series' version of our box-wall, lightweight mountain down jacket. Warmth to weight at the limit of possibilities via design innovation and unique materials. Now also available in custom sizes.

Typical Operating Temperature

-15°C / 5°F

Weight

380g / 13oz

Price

€786.41

As used by Jon Griffith (in green ultrashell fabric)

I can't praise it enough for overall performance. This is the warmest jacket for its weight that I've ever tested.
Lucy Wallace in TGO Magazine (Jacket was "Best" & "Lightest" in test)

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Size

What’s my size?

Sizing

Standard Sizing

The PHD Sizing Chart below is based on measurements without clothing, exactly the way you would buy a shirt or a sweater. A 42" (107cm) chest means that your bare chest uninflated measures 42". Inside Arm is measured from armpit to wrist-bone.

Size	Height	Chest	Waist	Inside arm
XS	155-163cm (5'1"–5'4")	86cm (34")	71cm (28")	46cm (18")
S	164-170cm (5'5"–5'7")	91cm (36")	76cm (30")	48cm (19")
M	171-178cm (5'7"–5'10")	99cm (39")	84cm (33")	51cm (20")
L	179-186cm (5'10"–6'1")	107cm (42")	91cm (36")	53cm (21")
XL	187-193cm (6'2"–6'4")	114cm (45")	99cm (39")	56cm (22")

Custom Sizing

Once you've selected a Body Width you can choose Body Length and Arm Length up to two sizes bigger or smaller. For example, a jacket with a medium (M) Body Width can be XS, S, M, L, or XL in Body Length and XS, S, M, L, or XL in Arm Length. If you have any questions about your size, please contact us.

Body Width. Use the chart below to find your Body Width. Measure yourself without clothes, relaxed with an uninflated chest.

Body Width	Chest circumference	Waist circumference
XS	86cm (34")	71cm (28")
S	91cm (36")	76cm (30")
M	99cm (39")	84cm (33")
L	107cm (42")	91cm (36")
XL	114cm (45")	99cm (39")

Body Length -- can be two sizes up or down from Body Width. Use the chart below to find your Body Length size. Measure your height without shoes:

Body Length Size	Your height in cm	Your height in inches
XXXS	139 - 144cm	4'5" - 4'8"
XXS	145 - 154cm	4'9" - 5'
XS	155 - 163cm	5'1" - 5'4"
S	164 - 170cm	5'5" - 5'7"
M	171 - 178cm	5'7" - 5'10"
L	179 - 186cm	5'10" - 6'1"
XL	187 - 193cm	6'2" - 6'4"
XXL	194 - 201cm	6'4" - 6'7"
XXXL	202 - 209cm	6'8" - 6'10"

Inside Arm -- can be two sizes up or down from Body Width. Inside Arm is measured from armpit to wrist-bone without clothes. When you measure your inside arm let your arm hang loosely by your side. Don't extend it horizontally.

Inside Arm	cm	Inches
XXXS	41cm	16"
XXS	43cm	17"
XS	46cm	18"
S	48cm	19"
M	51cm	20"
L	53cm	21"
XL	56cm	22"
XXL	58cm	23"
XXXL	61cm	24"

N.B. PHD clothing is unisex.

Notes:

Down Jackets are sized to fit over thermal underwear & fleece.
Shell Jackets are sized to fit over thermal underwear & fleece or light down clothing (e.g. Minimus Jacket): to cover thick down clothing, go up one size.
The arms of our outdoor jackets are designed to be long enough to keep your wrists warm when your arms are extended horizontally (when using trekking poles, for example) or when you are reaching above yourself (when climbing, for example). In this respect the arm lengths of our jackets differ from street/fashion jackets.

Standard Sizing Custom Sizing Set body width, body length & arm length

Body Width

Body Length

Arm Length

Size

Outer Fabric

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Features

A PHD K Series product: Ultimate warmth / weight performance
PHD's Unique 1000 fillpower down
Water-resistant Ultrashell outer. An excellent balance of weight, water-resistance and breathability
Superlight 10X inner fabric. Down-proof, wind proof and super soft
Box-wall construction for maximum loft
Lightweight front zip with internal draft baffle
3 zipped, insulated pockets:
- 2 waist level handwarmer pockets
- 1 Insulated chest pocket
Reflect zip pullers
Double-exit shock cord hem
Drop-tail back
Stuff sac
Stud-on superlight down hood with stretch Lycra edging
Pack size: 13 x 21cm*

^*Please note: We make our stuff sacs big enough to allow fairly easy stuffing rather than reducing the jacket to the tightest minimum.

Description:

This K Series product has been created for one single reason, to take warmth-for-weight performance to the limit of what's possible. Unique 1000 down, super-light materials, and specific design features mean that the word Ultralight now applies to this wide range of gear that will take you to the Poles as well as on a Sahara Marathon. More on the K Series...

Also available in custom sizes. We make clothing to order, so if you’re not a standard size we can make it to fit. To order a non-standard custom size, select the Custom Sizing tab, choose your body width, and then the body/arm lengths, shorter or longer, that work for you. A custom size takes us a little longer (typically two weeks longer) to make and, because it’s personalized, it’s non-returnable and our customer loyalty scheme can’t be applied.

Still the same warmth, still the same box-wall construction protected by a windproof water-shedding outer, just as it was in the original Yukon race jacket used in temperatures down to -30°C.* But at 380gm this K Series Yukon is 15% lighter and will pack down that much smaller.

Our lightest and finest materials, 1000 down, 10X inner fabric and windproof water-resistant Ultrashell outer, along with lightweight (No.3) zips have taken this wonderful jacket to a new level of lightweight performance.

The remarkable weight and pack-down size of the Yukon make it ideal for lightweight mountaineering, high level trekking, cold races and long distance hiking.

Weighing just 380gm (13.4oz) complete with hood, it combines a water-resistant Ultrashell fabric outer with a super lightweight 10X fabric inner. Its box wall construction and unique 1000 fillpower down boost its performance well beyond the rest of our ultralight clothing.

The handwarmer pockets are zipped to keep out blowing snow and there is a stretch drawcord in the hem. The insulated chest pocket keeps a GPS (or other battery-operated kit) both warm and easily available. The reflect zip pulls are a safety feature, improving night-time location.

This is not designed as a high mountain jacket like the Hispar or the Xero. But when the kit has to be ultralight and stitch-through jackets are just not warm enough, the Yukon can be the ideal choice.

*Note Temperature rating. Race competitors balance comfort against weight by a different scale to most other people. The Typical Operating Temperature (TOT) of -15°C is the NORMAL rating for this jacket, while -30°C is the racers' rating.

Ultrashell (weight: 40 gsm)

One of the lightest of PHD's coated materials. This ripstop nylon provides complete wind block and good water resistance at minimal weight. Ultrashell gives an excellent upgrade to performance with very little weight penalty.

Ultralight 10X fabric (weight: 26 gsm)

10X, PHD's first 10 Denier Fabric. 9,000 metres of the yarn used to weave 10X weighs just 10g, that's about the same as a £1 coin! For all its thinness 10X is amazingly downproof and with reasonable care will go on giving you good service for years.

1000 fillpower down

This rarest of all downs we reserve for the K Series. European goose down of unique quality. 1000 provides the highest warmth-for-weight performance possible from down. More on our down insulation.

“The warmest for its weight I’ve ever tested. I can’t praise it enough for overall performance ... “ideal for treks at altitude, multi-day mountaineering in cool conditions, and other cold undertakings where weight is critical”.
— "Highly Commended" in TGO Magazine's Gear of the Year Awards

"Uses the lightest materials to ensure maximum performance for minimum weight. Filled with 1000 fill power down, which has unbeatable lofting capabilities. Cosy, with ultra-lightweight zips. The hood can be removed if weight is critical. I can't praise it enough for overall performance. This is the warmest jacket for its weight that I've ever tested. Idea for treks at altitude, multi-day mountaineering in cool conditions, and other cold undertakings where weight is critical."
— Lucy Wallace in TGO Magazine (Jacket was "Best" & "Lightest" in test)

"The Yukon jacket - K series - was fantastic. You warmed up as soon as you put it on and you barely noticed you had a jacket on, it was that light-weight! It stashed to virtually nothing in the small stash bag, which meant that I could easily put it in my day rucksack with water, cameras, other clothing without it taking up too much space. As soon as we got in to camp, the jackets went straight on to make sure we did not get too cold standing around. The whole package was excellent - good, roomy pockets, easy to use zip and a very warm hood. It was a real saviour."
— Graham Brothwood, 9 day camping trip to Langtang Valley (Nepal) up to 3,840 metres.

"The Yukon is very light and the down fill is the softest I've ever felt, I haven't found one single shaft or barb inside the baffles of the jacket. The Yukon's hood … sits there perfectly and doesn't slip back or forward when I'm moving. It's so light and soft it might feel fragile in your hands but this a proper winter mountain jacket all the way."
— Peter Macfarlane (PTC) review in WalkHighlands.

"I am sure that you will be interested to hear that our blue Yukon jackets fitted perfectly and kept us warm and snug in the Arctic snow. The jackets were the envy of everyone on board - praise indeed from such experienced travellers."
— Nigel Humphries.

The comments below relate to standard Yukon Down Jacket, which is 95g heavier

"Many thanks for the jacket that you supplied me for the Yukon Arctic Ultra. [It] performed perfectly in temperatures down to -35c. The light weight and small size was also a huge help and helped me gain second place in the race. I ... am now the second fastest person over the course and the fastest European."
— Dr Stuart Gillet (wearing a prototype Yukon jacket).

"Without PHD kit I would have been toast."
— Jacob Hastrup 2nd place in Yukon Arctic Ultra 100 mile race.

"I'm always proud when I tell mountain guides and our guests about PHD and about the origin of my down clothing. The Yukon Down Pullover was been my best buy ever. In avalanche training courses it was possible to wear the pullover the whole day at -20 degrees Celsius!"
— André Henzen, UIAGM Mountain Guide, Switzerland

"I used a Yukon down jacket with Gore-tex outer on the expedition. It packs down small (half the size of my previous jacket), it's great for early starts and when the snow starts falling."
— Dominic Southgate - Imperial College Reru Valley Expedition (Zanskar Himalaya, India).

"For more serious winter outings I use PHD's Yukon Down Jackets. PHD make the best lightweight kit on the market. I just wouldn't go Munro bagging in winter without mine. It's fab."
— Phil Newby.

"Ben was impressed with the Yukon Jacket I bought for him. In fact, we ended up fighting over it on more than one occasion! Again, simplicity of design, total warmth, amazing lightness and quality of manufacture was what made it stand out from the rest."
— James Garrett.

"Thank you for the Yukon jacket! It fits super, is warm and nicely made."
— Mark van Onna.

"Just wanted to thank you for the prompt delivery of my Yukon down jacket. It is fantastic and I have worn it constantly since it arrived."
— Lise Cooper.

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