A little is all it takes in the Orthaheel Women Tide Thong Sandal to keep you aligned with comfort! This Orthaheel flip-flop features an EVA orthotic midsole to help realign your feet and ankles while you reap the benefits of a better body posture. The built-in Orthaheel orthotic invented by Dr. Philip Vasyli also provides relief from plantar fasciitis and excess pronation (foot rolls over too much) to keep you steady and comfortable on your feet.