Josef Seibels seem made on a last that was fashioned for my feet. I have 6+pairs in various styles, from boots to clogs to sandals. I have muscular, dancer's, high- instep feet that are usually Ok with regular M width, but more on the wide side. These sandals are perfect for me, and I have been wearing them lots and loving them. I do have problems with some Seibel styles being weird, but these are great. If you have slender feet, you may slip through, as there's no elastic insert over the arch, but they're perfect for me.