I hate to write a poor review for these Chaco's because I personally love the company. I also own a pair of z/2's and z/1's both of which I love. However, the flip flops just don't do it for me. After extended use, they make my feet hurt. The straps rub on the top of my foot, and because of this, I hardly ever wear them anymore. They sizing, for me, was the same as my other Chaco's, which I would highly recommend. This product, sadly, has proven to be sub par for me. The up side, however, is that they are both durable and made well which can always be expected with Chaco.