I got these sandals on a whim to replace my old reefs.  They are super comfy and have plenty of arch support, and the material are very comfortable.  I will say these sandals are made to get wet.  However, you'll have very little traction on the footbed.  If you're going to be slogging through water, paddling and the like I would recommend water shoes, or something with a heel strap.  Overall, great sandals, just keep them dry!