I have a narrow heal and normal toe width.  To get these snug around the heal I had to sinch up the toe section almost to the max possible.  But in the end, they work fine and I am confident they will do the job.  BTW, I am normally a 9.5 size and I ordered the 10 under the advice of other customers.  I believe the 9.0 would have been too small and not protected my toes.