The double arch is helpful if you have high arches as you break in the flip flop. I have an older i phone that doesnt hold a charge like it used to and I like to keep it close by wherever I am at home. The only thing that was negative was one of the little loops on the shoes broke off during the week I had them. For some reason the white and black ones were $50 - at that price point they become less attractive. These are absolutely gorgeous shoes, more beautiful in person than in the picture. The USB cable provided is a bit short in length and I would prefer to see a bit longer but is not a deal breaker. My initial impression after one day of use. Fit perfectly very comfortable and easy to wear Also some gifts! For reference, I am about 53" and 160 pounds.