I have been wearing these sandals for about thirty years.  They are very durable and have the best supportive arch.  The rainbow colored portion of the foam can be washed and retain its colors. If your feet are narrow, it is best to get the wider strap.  This helps prevent you feet from flowing forward off the shoe.  It's hard to determine the correct size if your feet are narrow from the information given on sizing.  I had to return my sandals and get a smaller size.  Be sure to purchase them through Amazon.  I went through the American Sole CO. when the sandals ordered through Amazon did not fit and I wanted to exchange them. I thought it would be faster since I was going on a trip. Wrong.  It has taken 2 months to receive the exchanged ones.