I really like these sandals. The straps were a bit too sturdy at first, but after having them on for a couple of hours, they relaxed and now I don't even feel them. I don't think they will loosen anymore. I was afraid my foot would just slide out, but it doesn't. The front strap that goes across the toes isn't as elastic, so it helps keep your foot in place. My feet swell easily, so these adjust perfectly and don't feel tight.

They are very flat, so if you have problems with flat shoes, I wouldn't recommend them. I walked for 6 hrs in them and only felt my heels a little sore towards the end.