Xero Down Salopettes: K Series

'K Series' version of our Xero salopettes. Exceptionally lightweight high-altitude expedition salopettes. Warmth to weight at the limit of possibilities. Now also available in custom sizes.
Typical Operating Temperature
Guideline minimum temperature. Sleeping Bag TOT: you should get a night’s sleep, under normal circumstances. Clothing TOT: you should feel warm enough, assuming low/moderate activity. Sleep System TOT: relates to full system. For more details, see our Technical Briefing.
-40°C / -40°F
For clothing, weight is for size: M. For sleeping bags, weight changes with selected length/width. N.B. there may be some variation in the weights of finished products.
745g / 26oz
Xero Down Salopettes K Series

Very happy to report that the Xero Salopettes performed fantastically and kept us warm and safe especially during summit day where temperatures dropped below -30 deg C.
Robert Gatt, Challenge8000, Cho Oyu.



  • PHD 'K Series' Product: Ultimate warmth / weight performance
  • Unique 1000 fillpower European Goose down
  • Water-resistant Ultrashell outer. An excellent balance of weight, water-resistance and breathability
  • Superlight 10X inner. Down-proof, wind proof and super soft
  • Box-wall construction for maximum loft
  • Differential Cut allowing full down loft
  • Tough HS2 fabric reinforcement at knees & bum.
  • Side zips:
    • full-side opening
    • 2 way (join at the top)
    • Overbaffles with intermittent Velcro
    • Underbaffles for extra insulation
  • High back:
    • suspended on braces
    • back waist elasticated for snug fit
  • Pocket - small storage pocket on chest
  • Knee - all layers articulated
  • Fly zip
  • Navy blue inner for quick drying
  • Stuff sac
  • Pack size: 20 x 34cm*


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


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 and choose the waist and inside leg sizes 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.

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...

An even lighter version of our Xero Salopettes. Designed for fast moving expeditions to the highest levels or for any extreme cold weather venture where weight is at a premium. These down salopettes use highly efficient lightweight construction, combining with the Omega or Xero Down Jackets to provide highly versatile packages, warm enough for the most severe conditions.

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.

Waterproof HS2 outer fabric (weight: 88 gsm)

HS2 is a 2-layer laminate, a high-spec option for the outer layer of our insulated gear. This ripstop fabric strikes an excellent balance between lightness and durability. It is light enough for our Belay tops and tough enough for expedition use in our Omega clothing, while the Kappa clothing makes full use of both its qualities. HS2 is completely waterproof (when the seams are taped) and offers excellent breathability. (Weight: 88gsm).

"Just a quick note to let you know that ALL 5 members of our team reached the Summit of Cho Oyo (8201m). Another member of the team wore [your Xero down] Salopettes and ... was comfortable and impressed. Thanks for the great gear."
'Lanx', Equipment buyer, UK Reserve Forces Seven Summits team.

"Very happy to report that the Xero Salopettes performed fantastically and kept us warm and safe especially during summit day where temperatures dropped below -30 deg C."
Robert Gatt, Cho Oyu.

"Many thanks for the Xero salopettes for Cho Oyu which worked very well."

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