Gold ToeMen's Canterbury OTC Extended Sock,3 Pack

Q: Is this a pack of one pair or 3 pairs? thanks

3 pairs. Good value on some perfectly decent dress socks.

Q: Do these socks keep your legs warm?

Not really: these are a year-round item, and one feature I like them for is moisture (sweat) wicking. If you want a warmer over-the-calf sock, Gold Toe makes a merino wool version that I used to use. Those helped me get through Chicago and Boston winters. Good luck!