I purchased these slippers for my 15-year-old daughter, who has a problem with pronation.  She loves the zebra gray and black color.  These slippers offer her the support needed for her arch and feet.  The soles are very firm and not very flexible, which has its positives and negatives depending on your needs.  With the solid soles, the slippers should wear very well and last a long time.  The velcro allows one to adjust for a snug or loose fit.  These slippers were expensive, in comparison to other slippers; however sometimes one doesn't have a choice but to spend more to get a shoe with proper support.