I wear wool socks. That's pretty much all I have. If you have wool socks, you know as well as I do that they tend to wear out on the pressure points - the ball of the foot, and the back of the heel - pretty quickly.
With the price of good wool socks, though, it's not very cost-effective to just toss them once they get thin or get holes worn in them. That's why it's a good idea to learn the age-old practice of sock darning!