I typically wear between a 6 1/2 and 7 in women's running shoes. I bought the kid's size 5.5 based on other reviews. They fit perfect with thin socks. They are very cushy, but the arch is pretty flat.  I have high arches, so I wear arch supports.  I use them for jogging on my treadmill and they are just as comfortable as my women's gel nimbus 16s.  I love the bold pink color and I got an awesome deal buying the kid size.