You can't beat a good wool sock
This is the part of the wardrobe that is easy to take for granted. However, on long rides (or runs), socks can play an important role in overall comfort and performance. Some people prefer synthetic fibers, which have some excellent benefits, but for my money it has to be wool.
There are few things on this earth more rewarding than a good wool sock. Do yourself a favor, get a few pairs. You will not be disappointed.
Sizing is accurate, fit is nice and snug, durability is juggernaut status.