I have parkinson s and have experienced freezing which at times has caused me to fall. I purchased DWAGS sandals with strap around my ankle and across the top of my foot. I had these sandals on for the first time a few weeks ago, and took a fall that put me in the hospital. My daughter says I fell because these sandals have too much of a grip and there for contributed to my falling. My thought if the grip is smooth it would be more likely to cause a fall. These DWAGs are very comfortable and my legs do not hurt or feet if I wear them all day.