The sizes are women's [see description with For Women in the title--it's easy to miss!]. I tried a 9 and it ran a little big. So if you like a good fit, go for 8.5 size. Note, this shoe is very lightweight, and I worried about the ankle support. The bottom is fairly strong but the sides are weak. I ended up returning due to size and concerns about lightness of the shoe on the sides/top.
The gender designation is listed in the title of the item. This item is sized for women.