I wear a 6 1/2 shoes, the small fits very well.  Has some elastic in center of sock that keeps it in place, soft, cushy.  I say 4.5 stars really because I have never found a sock that is perfect as far as toe seam, I have this weird sensitivity to sock toe seams bothering my baby toes and I have yet to find a sock that is perfect, but this one is the best so far, though they are expensive I am ordering more, I like them well enough, comfortable for working.