I think Crocs makes a good product, but they do not make a Flip Flop.  They are very stiff, very slick when wet.  I bought them for a deployment to Afghanistan and I ended up not using them after the first month.  The bottom of my feet were protected from the rocks, but the strap dug in between my toes and on top of my foot.  I need up going back to a cheap pair to finish out the deployment.