This is the second pair of Crocs I've had where the rivet that holds the back strap failed. This time the female rivet was mashed in and would not join with the male rivet to form the connection of the back strap to the clog. I called Croc and they no longer will send you a spare rivet, like they have done in the past. Thanks to Amazon though, I'm returning the clog. Amazon sent me the replacement pair of clogs which I received today, even before I return the defective pair, which I'll return tomorrow. Another great reason to shop at Amazon!