I have 2 other vionic sandals which are comfortable. these are not flexible and they seem to not be as cushiony as my 2 other styles. I can't figure it out. They are also not as cute as the other ones. I can get over the cuteness, I am fairly "young" but have serious foot problems and arthritis and I am disapointed they are not very comfortable. Maybe time will break them in? Makes me wonder about quality control. The other sandals were comfortable right out of the box.