After losing two toenails this spring, I had to switch over to open sandals to continue my workouts. I walk at least 5 miles a day at speed. I like these sandals a lot! The bottoms are slightly "grippy" so I can still hit my pace. There is not too much arch support, which for me is a good thing. Arch supports always feel like a lump to me. The velcro closures allow precise adjustments (quickly, during use) and the ankle strap holds my foot securely. The M width is generous and stable. I wear these with Thorlo padded socks to increase the cushioning. I have (very) long second toes, so I was worried about the lip around the front. Happily, the lip does not bother me, but I ordered up a size to allow for socks. Not so stylish (especially with those socks!) but fit to my purpose.