Fit flops came highly recommended by a few friends, hence after thinking it over for a few months (it is a pricey shoe) I capitulated and bought this pair, which I think looks the most attractive amongst the limited styles on offer. I have knee/leg issues and would wear sneakers on days when I expected to be on my feet for a few hours. Since I bought these, my sneakers have been "resting". However the footbed looked noticeably worn after the very first time I wore the fit flops, that was disappointing at this price. I don't know whether the "toning" feature actually works, what works for me is that I don't have to wear my sneakers all the time everywhere, I am able to stay on my feet for long periods while shopping/ running errands in fit flops comfortably enough. It's a bonus that they look good too. I wear a US 6.5 in sandals by and large, US 6 in the Pietra fits just right.