Molded to the contour of your foot. Great material, antimicrobial, looks awesome. No need to ever buy another type of sandal. I also paid about $40 less than you can find them almost anyplace else. I waited about two years to buy these. When the price came down due to the time of year or a holiday special, I jumped at it. I could not be happier. I found as did others that they run a bit small so rather than get a 9, I bought 9 1/2 and they are perfect. When you first get them they are a bit stiff but with each time you wear them, they start to soften up and mold to your foot. All pros, no cons.