I've just completed a grueling test of these sands as river sands. I love her. They fit well, look great, but don't hold up well in the river. They were my favorite shoes on a 3 week Grand Canyon expedition. Unfortunately, they didn't hold up in the deep mud and the constant water and high temperatures destroyed the glue sticking to the sole. I will glue them again, and they will remain universal sandals. I even bought a second pair after returning from a trip. I like them, just not for extreme