The straps are just too loose for a comfortable fit.  The foot bed of the shoe is too heavy, so with the loose straps, your foot never hits the shoe the same.  It makes both of my feet hurt and makes the plantar fasciitis worse. It's a cute sandal, but for the amount of money for the shoe, plus the fact it's supposed to be comfortable, it should fit better.  And since I've worn them outside, I can't return them, otherwise I definitely would.  My Vionic Tide II flip flops are WAY more comfortable.