They don't stay on the foot at all, their straps are not stable. The anatomy of the foot is not considered at all. Their quality is very low, almost plastic. I knew they weren't leather, but I needed sandals for a specific occasion and thought that for one time use they would be OK. They weren't. I ended up taking them off in the middle of the night and wearing them like mules.
Also, the "architecture" of the heel is very bad. They have a strange tilt and heel-to-sole ratio, resulting in swelling of the foot—those with such sensitivity will understand. The front strap becomes like the elastic band used for blood donations.