Patagonia socks are 65-75% wool depending on the model and the rest is nylon, polyester and spandex.

My Patagonia expedition socks are about the best you can get as far as I'm concerned for that application.

I also have Thorlo ski socks and Smartwool, plus some old 100% wool socks. The Smartwool are about 70% depending on the model; I can't find any info on the Thorlos except that they are a blend of wool and some kind of synthetic.

The bottom line-insisting on 85% wool is (warning-bad pun alert!) out of step with modern sock technology.
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