Quote Originally Posted by CalebJ View Post
'Technically it is down'? What??
Yes.

Yak down is a uniquely Tibetan product
Yaks live at very high elevations in the Himalayas. They have three layers to their coat. When the innermost down layer sheds, it is collected by locals and sold for clothing yarns. This inner layer is down. It is hollow core and around 16–20 microns, not quite as fine as cashmere but cashmere has poor tensile strength whereas Yak has much higher tensile but I believe a little lower than unprocessed merino (I could be wrong). Since this inner layer has a hollow core, it will absorb very little water (unlike cotton).....without going into thermodynamics, this is good. Basically, these will mostly be worn while sleeping and then on cold mornings. I would wear them in drizzle but if cold rain.... I would have this Yak leggings on and goretex over them, I am confident weather will not be an issue.

The biggest benefit? It absorbs no odor. None.

https://www.reywafibers.com/blog/dis...0merino%20wool.

https://en.wikipedia.org/wiki/Yak_fiber