I have been using the Darn Tough boot socks for the last couple months, and have put them through the wringer.
To say I am pleased is an understatement! These are, hands down, the best socks I have ever owned. I am not one to attempt to go days on a single or even alternating pairs of socks. I usually accept the added bulk and weight, and carry a pair for each day I plan to be in the field.
I have been shocked at how well these socks wear for multiple days. The fit doesn't stretch and sag, they maintain a low or unnoticeable odor rating, they're extremely comfortable, and my favorite feature is their ability to help regulate heat. I tend to run a bit on the naturally cold footed side, and have stayed more comfortable in these socks this season than I have in years!
I absolutely will be buying more and highly recommend the Darn Tough line to anyone looking for a better sock option.