These are wonderful, I bought these for my Mother-in-law, her feet are a different size everyday due to swelling, and she is also diabetic.  These expand like a flower blooming they just open all the way around, so it is easy for her to slip her feet in and are very comfortable for her feet without rubbing.  And they come in all her favorite colors. I have no idea how long the "string" that runs around the edge will last, but it is sturdier than I though it was.  And for the reasons I bought these shoes, if I have to get them again, beacause the strings breaks,  I will.  They are that succesful at doing what they need to do.  So a home run.  Thank you  And the seller shipped them out in a very timely manner.