Most of our styles* are unisex. In fact, when you receive the shoes, the mens and womens size will both appear on the shoebox and on the size label on the shoes. A mens 8 is the same exact shoe as the womens 9.5.
We list them on 2 different pages on the website because it simplifies the ordering process -- if you need a mens 8 you click that size on the mens page. If you need a womens 9.5 you click that size on the womens page. In this case, the size label on the shoe will read mens 8/womens 9.5 -- same exact shoe!
* The womens Laguna, Trailhead, and Mesa are the exception -- these are designed with some narrower attributes. Please look at the specific product pages for more details.