The sizing of the socks is a little tricky. I got a pair of socks in Medium and Large. The medium size is equivalent to lady US regular 9-11 size, which fits US shoe size 7 to 9. If you have a small foot size and wear shoe size 5 or 6, the heel will be a bit too large. I wear shoe size 7 and the medium size is acceptable. I think after several washings the fit will be perfect as wool socks tend to shrink a little.
The large size fits my husband foot, he wears size 8.5D shoe. He has a comfortable fit, and it looks like it accommodate a larger foot as well.
Here are the sock measurements from toe to heel (unstretched):
Medium toe to heel: 8" long
Medium cuff: 4 3/4"
Large toe to heel: 9.5" long
Large cuff: 4 7/8"
Overall, excellent quality, good fit.
You can find it on Amazon by following this link.
Ali Julia review ★★★★★