LOVE these sandals.  I have owned the same pair before and after MANY years of wearing them regularly wore them out!  I receive another pair to replace them for my birthday last June and was SO HAPPY and have worn them for a year now.  I am sorry to say that 2 of the inside straps have frayed & ripped from the sandal, making them unable to wear or repair.  I have owned many pair of Birkenstocks over the last 30 years this is the ONLY pair that have fallen apart and not been able to wear after 1 year.  Very disappointed that I have no recourse :(