The strap is made from a stretchy fabric, making the shoe fit loose and sloppy.  I have a pair of mary jane shoes, from this manufacturer, that have a strap that is fixed, once the velcro is adjusted.  I was hoping to replace those shoes with these, as I walked through the bottoms of them.  The fixed strap provided arch support, but the elastic provides none.  These shoes were a huge disappointment.  Also, the toe box was narrow for the typical Merrell fit and the heel was wide, making the fit a bit awkward as well.