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Easy one sir. Merino wool.
Darn tough socks hands down. I use to wear smart wool and they don’t compare. They last a crazy long time. I do like the smart wool black merino liner socks though underneath. But often times I end up just wearing the darn toughs.
Not all merino / smart wool are made the same. I have purchases some of the cheaper socks off of Camofire and they were horrible. The elastic on the calf would retain a memory and after the second or third trip out, they would slowly creep down around your ankle. I really like over the calf socks for that very reason. I will need to try the darn tough over the calf socks. The smart wool socks I posted are not overly thick so if it is cold out, most would need to double them up. Smart wool makes a heavier sock but again...it does not have the elastic qualities I like to keep the sock up around my calf.