I am reading these reviews, but my boyfriend did not encounter any of these things other people are saying... We were going away, and had planned to be on the beach and go jet skiing. He honestly wanted them to wear to go jetskiing more than just staying on the sand, so I bought them for him and he did both; he loved them. They stayed put, kept his feet comfortable, he loved the pull tie, and he didn't have sand in his feet. The sole did not move for him either... All in all I have to give it a good review. I don't know if they're speaking about over time, but so far, it served us very well.