I've been out walking in these sandals almost every day.  They have been holding up well in the heat and the outdoors.  The velcro straps are thick and strong.  They won't come off without being pulled.

The insole is pretty comfortable as well.

I have to repeat the other reviewers gripe about the heel strap and the waste of almost 2 inches of sole.  The heel strap can't be adjusted so you end up with an inch or two of sandal that you can't use.  Not a deal breaker but something to keep in mind if you have long feet.

The tread isn't bad and looks like it will be OK on sand, sidewalk, grass, and pavement.  However, you don't want to wander into the woods wearing these.  The same applies to slick surfaces.

Overall, pretty good.  Minus one star for the heel strap defect.