Seems like a lot of companies are converting their socks these days to polyester and nylon.  These socks are 80%+ cotton and let my feet "breathe."  They do not have reinforcing "pads" on the bottom like some more expensive socks, but they are nice and thick and I imagine will last a long time (will update this review if that's not the case).  I like the low-profile of these socks, and they fit well.

Overall, very happy with them, hope this helps!