The upper velcro is a little short - about an inch too short, so the little bit of velcro that does catch has to be very carefully connected to prevent from coming loose.
Also, I've gotten roughed up skin from the upper velcro being too tight.  Found tiny scabs as a result. I'm hoping that wearing them in water and a little stretching will give enough to make them comfortable.
BTW, I owned another pair of Columbia sandals, purchased in 2007 which were fantastic and lasted many years.  The last few years, my repeated attempts to buy and be happy with Columbia footwear has failed, multiple times.