These fit well straight out of the box, but I wore them for two weeks and the back strap has stretched out so much they now flop around on my feet when I walk and threaten to come off. The elastic strap at the ankle was very strong at first so they stayed on my feet, but it seems to be losing power as well. I'm now on the third week of wearing them (not even every day) and I don't think they're going to stay on my feet much longer. The black straps also leave color stains on my feet. It bums me out because I really like how they look. I would not recommend buying these.