I purchased these to attend a wedding a few times, and since I didn't want to get them dirty, I used other shoes for transportation and only wore these at the venue. They are simple, make your legs look good, and are easy to wear. I'm pricing them at a Shimamura price, so if you're looking for formal shoes, I recommend these! When I used transparent insoles, black spots remained. They are not sticky. There is no problem with wearing them, but please refrain from purchasing if you are sensitive about such things.