Ok, I have flat feet, plantarfacetis (which I'm sure I spelled wrong) hee spurs. I wear a 7 1/2 and live in Asics all day so I go through several pair a year. I've tried so many brands of sandals I gave up until I saw a lady at a museum I was volunteering at In Wells County. I asked her, she was older and explained the brand, her foot problems, they were expensive BUT she wears them all the time, they looked brand new and were 5 years old. After the fair, I went Amazon shopping. Imagine my surprise that they don't only make sandals but other shoes as well and SO MANY. After researching, reading reviews, I chose this pair and anothe for several reason. One, they do have a small side to keep your foot in place, are adustable at toe and by ankle. The base looked like an off road tire for a small bike and had a supportive foot base. I LOVE THEM! I wore them all day the first day. No blisters, no foot or back pain (did I mention I have a horrible back that needs surgery?) Yes, the front part kinda needs mole skin underneath in a small area, but the strap fits back far enough that if a person has hammer toe, you are safe. The size says 7 1/2 -8 which is what I ordered, and it fits perfectly for a 7 1/2 foot. So in Eurpean in would be 39. The leather is very nice, smooth, good quality, not cheap. They came quickly and are well worth the price.I have a friend with high arches, and hammer toes, she tried mine and is ordering a pair. She paid over $200 for the sandals she has.