Before starting Khunu we read with great interest the incredibly detailed study conducted by the UN Food and Agriculture Organization on yaks. Whenever I see these amazing animals sitting unconcerned in sub-zero temperatures I’m curious about how they survive such extreme conditions, seemingly in comfort. Research shows that yaks can survive at ambient temperatures down to -40oC. I know that I most definitely can’t.
Yesterday I went back to the report to work out why this might be, and re-read an interesting temperature analysis which looked at the contribution the fibre makes to keeping the animal warm. To quote the study:
“The coat consists of three types of fibre: coarse, long fibres with a diameter in excess of 52 m, down fibre with a diameter below 25 m and mid-type hairs with diameters between these two values. The down fibre is a particular attribute of the winter coat of the yak to provide the additional insulation then required.”
As you know, in spring we take that super soft and warm down layer from the animal (by then it’s starting to question the need for all that insulation), and convert it into soft, warm garments just in time for when you need them.
But back to the hard data behind the study:
Measurements were made on ten animals on three successive days in the cold season in February (mean ambient temperature -18oC) and on nine animals on three days in the warm season at the end of May (mean daytime ambient temperature 22oC – though somewhat windier at that time than in February). Figures 4.1 and 4.2 show the measurements.


Chart 4.2 shows that, during winter, when the animal retains a greater proportion of its downy fibre, the outer layer is below zero, yet the skin temperature is over 25 degrees centigrade. Downy fibre is clearly warm.
Now we obviously can’t claim that wearing Khunu will raise your skin temperature 25 degress above the ambient air temperature, even though most of our products are made from that very same downy fibre, but we will claim that yak down makes the winters more comfortable and can save you a fortune on central heating bills.

Customers often tell us that wearing Khunu makes them more interesting and attractive to the opposite sex (as is clearly shown here in this photograph). I wholeheartedly agree with this, but in the absence of scientific proof we won’t go making such bold claims. Science or no science we’re sure of one thing though – when you see the new collection next week you’ll be convinced that there are many good reasons to be wearing yak this winter!
The full FAO study can be found here.
Our new collection will be available on the Khunu website Tuesday 18th October. Sneak previews are expected to leak onto our facebook page sometime before then.