Xero Down socks (long)

Knee-length version of our high-altitude expedition socks. Light, compressible, comfortable. For warmth in high camps.
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.
330g / 12oz
Xero Down socks (long)

The Xero booties were great for sleeping in and I could also wear them inside my Sportivas for mooching around camp. All in all, perfect.
Nick Lewis, Antarctic Logistics



  • Exceptional 900 fillpower European Goose down
  • Water-resistant Drishell outer fabric
  • Tough Tempest fabric soles
  • Box-wall throughout - no stitch-through seams - for maximum loft
  • Long: knee length with rear zip
  • Elasticated tops
  • Black inner for easy drying
  • Stuff sac
  • Colour: Royal Blue and Black
  • Pack size: 10 x 18cm*


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


Designed for fast moving expeditions to the highest levels or for any extreme cold weather venture where weight is at a premium, the Xeros pack up to almost nothing. Using Drishell fabric, a highly efficient lightweight construction, and a full length rear entry zip, these down socks can be a real boon on expeditions. This long-length version of our Xero socks provides extra insulation to the lower leg resulting in even warmer feet.

Also available in ankle length.

As used by Ben Saunders in the Serco TransArctic Expedition, Rosie Stancer, Rosie Swale Pope, in the Yukon Arctic Ultra, and by many others.

Included in Geographical Magazine's "Ten of the best" list of essentials for keeping the cold at bay.

Water-resistant Drishell outer fabric (weight: 54 gsm)

Ripstop nylon with an ultralight coating: achieves total windblock, along with high breathability and superior water resistance. Superbly efficient for a very light overall fabric weight.

900 Fillpower Down

European goose down of very high quality. A truly excellent down with large clusters, consistent quality and lively long-term performance. More on our down insulation.

Tough waterproof Tempest outer fabric (weight: 160 gsm)

A technically advanced waterproof breathable material. 100% Nylon. Good abrasion and tear resistance, yet offering high flexibility for such a tough material.

"[Your] Xero down socks are great."
Ben Saunders.

"The Xero booties were great for sleeping in and I could also wear them inside my Sportivas for mooching around camp. All in all, perfect."
Nick Lewis, Antarctic Logistics.