I bought 2 similar pair of Dr. Scholls sandals through amazon, same day.  One pair is fine.  This one has a fake buckle.  I tried and tried to unlatch the buckle to let it out a couple notches but it wouldn't unlatch.  Finally I compared the good sandal buckle with this one.  This one has no hinge.  It's just a wrap-around piece of metal or maybe plastic that is stuck in place.  There are 4 or 5 grommets in the strap, but they are useless.  Sending back.