This is my 2nd pair of Orthaheel sandals. I generally wear Birkenstock's as recommended by my Dr. I have plantar fasciitis as well as high arches and very narrow feet. I bought Orthaheel sandals with adjustable straps. All I can say is anyone who has foot issues like mine, it is a must to get Orthaheel sandals. I can't believe how comfortable they are compared to Merrills, Skechers & Birkenstock. I've tried them all. These are the BEST hands down. I also found I don't have lower back pain after walking in them for hours. I had no problem adjusting to them the first time. Comfortable from the start.