Custom Sized Wafer Down Trousers: 'K Series'

Custom sized version of our lightest insulated trousers. Specify Waist and Inside Leg sizes independently
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.
0°C / 32°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.
130g / 5oz
Wafer Down Trousers

I almost cried when I packaged these up to return them to PHD as they were absolutely brilliant.
Alice Morrison on the Everest Trail Race



  • PHD 'K Series': Ultimate warmth / weight performance
  • Insulation: PHD's Unique 1000 fillpower down
  • Outer & Inner fabric Ultralight 10X
  • Stitch-through for lightness
  • Adjustable shock cord at waist
  • Lycra edging at ankle
  • Stuff sac – size 0.5 (8 x 13cm)*


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


Custom sized. Choose the waist and inside leg sizes that work for you. This custom sized item 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. These trousers are also available in standard sizes (with a 5 day dispatch time).

Wafers are the new ultralight down clothing from PHD. Real outdoor gear which will add a raft of choices to your gear selection. Trousers, Jacket, Vest, and Socks. Each of them some of the tiniest and lightest we have ever made.

The natural complement to the Wafer Jacket. Cosy camp gear, which will boost the warmth of your sleeping bag too. Fits into our new half-size stuff sac.

This is the ideal warmer for spring or autumn camping, when that cold little evening wind makes the sunny afternoon a distant memory. And if the night's a bit colder than you expected, keep the Wafer Trousers on inside your bag: a definite booster, particularly if you've got the Wafer Jacket on too.

  • Ideal companion in a cool camp, bothy, or hut.
  • Pack without noticing the weight (or the bulk).
  • Midlayer to boost warmth: warmer than a fleece weighing more than twice as much, and windproof too.
  • Add performance to your sleeping bag.

Note: Fabrics as thin as 10X do not stand up well to direct abrasion, so we do not recommend our Wafer gear as actual climbing outerwear. But for all its thinness 10X is amazingly downproof and windproof and with reasonable care will go on giving you good service for years.



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.

"I wore my wafer trousers for three days non stop…never climbed in such horrific weather and conditions."
—Jon Griffith climbing Link Sar, Pakistan

"Astoundingly warm for the weight, and very comfortable. I ended up sleeping in it more often than intended as I was often reluctant to take it off before going to sleep."
TGO Magazine's Equipment Editor, Chris Townsend, following a 400-mile 29-day test in the Rockies.

"I almost cried when I packaged these up to return them to PHD as they were absolutely brilliant. Simply put, they are very light and very warm and helped me to recover every night as I just wasn't cold."
—Alice Morrison on the Everest Trail Race