In the US, a woman's shoe size is one smaller than the equivalent male shoe size.
So a six in women's shoes is a five in men's. Use the chart below as a general guideline
when selecting booties. Unless specified otherwise, all booties come in MENS sizes.

If you wear a half size (9.5) select the next size up (10).

Womens Size Mens Size
6 4
7 5
8 6
9 7
10 8
11 9
12 10
13 11
14 12
15 13

For reference only, sizing is not guaranteed.