In my experience of living through 20+ winters in the mountains of New Hampshire, hands down the best wool sock producer in the USA is
Darn Tough Socks located in Vermont. Their socks are guaranteed for life. If they fray or wear a hole, send them back and they send you a new pair.
They have socks in distinctive styles, for different disciplines, and they come in varying sizes!
How about this one with rainbow stripes for your world championship vintage ride?
I promise you won't be disappointed.