WOW - these socks are great. Didn't like that elastic around the arch the other smartwool socks I have owned. Bugged me. These don't have it.  Very thin and soft, but amazingly warm. You'll like 'em. Men with regular size (9-11) need to get LARGE. Those of you with the really big feet need to get even larger. Men's small would work OK for most regular size women. - JayHutch