These slippers felt OK at first, but then I began to develop knee pain every time that I wore them.  I wore them for about 3 months.  And, there was also too much space between the top of my feet and the straps.  In addition, I would experience static shock when I wore these slippers and turned on the lights in my house!!  One more thing, Vionics are made to align your feet back to the straight position if you walk inward (Pronate).  But if your walk outward (Supinate), what is the positive effect? In my case: nothing!!!