I ordered size 8 which were too small and sent them back free of charge for size 8.5  I had no problems doing this and the turnaround was very fast.  You just put them back in the original box and drop them off at any UPS station.  The sandals are awesome and are much cheaper online.  At the store they cost $78.  They give a very nice support for the arch of my feet.  I have to finally throw out my last pair of teva's that I bought in 1993!  I use these on the beach, boating, and for wearing around town.  These are definitely worth the extra money when comparing to cheaper models!

updated 06/21/2016
I am updating a bunch of my reviews today...
These are still going strong and I bought them in 2012.  I love using them if my feet have to go in the water (like when putting my canoe in or helping with my friends motor boat.  They do great in the water and on land!