I ordered this in the white/malibu blue color. In most sandals I wear a 7.5 and I ordered an 8 in this. It fits perfect. They are super comfortable and unlike the usual creepy, weird look of other "fitness" shoes, these look cute and normal. No way would I have been caught dead in those other ones. I went on a walk with my dog and I could definitely feel the added little leg workout. I highly recommend these! One word of caution...I have fairly narrow feet and these fit perfect. The outside of my foot comes right to the edge of the shoe. This may not be a good shoe for those with wider feet.