This sandal has a buckle, it's comfortable.  The buckle gives me better ankle support, keeps the sandal secure on the foot, and there is comfortable elastic under the buckle so there is a little give when you need it.  Clarks, I love them.  My previous pair of leather sandals is still in service after 5 years.  The end of the leather strap beyond the buckle does not curl and stick out the way velcro straps do.  I cannot stand velcro.  This is a classic style.