(this is specifically for black pairs)

I have worn fit flops for the past 4 years. I own the black pair but started out with a white and pink pair. If you are outside walking for any time frame, buy the black pair!!! The white ones' inner part (where your foot lies) quickly turn an ugly gray color from dirt that doesn't come off. That being said, my black pair obviously doesn't show dirt and has lasted 3 summers compared to the white pair that lasted 1 summer. I am now in the market to find a new pair because the leather piece is finally giving away. I also own the winter boot that can flip into a clog. Very comfortable and quality materials (winter and summer pairs alike).

Now the infamous "exercise" part. I can't give all the credit to the fit flop, but since I do own summer and winter, I wear them nearly 100% of the time. I walk a lot for work, and I notice when I wear other shoes, my feet hurt by the end of the day. Not the case in fit flops. I received went on vacation to Las Vegas and we walked everywhere. My feet hurt the first day in tennis shoes, but never hurt in my fit flops! Also, I am by no means in shape, but my back leg muscles and calves are fit and easy to flex. I do occasionally suffer from knee pain but I can't trace that to the shoe.

I gave this 4/5 simply for the dirt problem with the white shoes and uncertainty of true exercise component.