I purchased these because I suffer with plantar fasciitis in my right foot and believed the Vionic brand may be able to give me sime relief. I wanted something to wear in the summer heat that would have the arch support I need. I chose these because they appeared to be adjustable to make them tighter across the top of the foot with a velcro strap, which is something I need to prevent sandals from flopping around on my narrow feet.  When they arrived and I first put them on I was disappointed to find that the strap was not adjustable at all. There is velcro, but you cannot pull the strap any tighter and you can't loosen it either so I don't understand why the velcro is even there. Also, the footbed is a slippery almost vinyl-feeling material. The heel cup is not deep at all and my feet slid around quite a bit when I tried to walk in these. This experience has made me wary of any Vionic product. I had a bunch of other Vioni styles of sandals and shoes on my Wish List, but now think I may delete them.