Check out Darn tough socks as well. I was issued a few of these, after some hard use down in Georgia, they are my new favorite socks. I've tried the USGI wool socks and the fox river synthetic socks. The GI socks work well enough but they will wear out over time and begin to ride down in your boot. Darn tough will stay put over extended periods and they resist odor, they are pricey though.