VIONIC with Orthaheel Technology Women's Cancun Black Sandal 6 M Leather Built-in, podiatrist-designed orthotic footbed helps support, stabilize and naturally realign your feet for better posture and balance. Leather upper has an adjustable buckle on the backstrap that offers a customized fit. Durable, textured rubber outsole provides traction to help keep you confident on your feet. Deep heel cup and raised arch support help hold your foot in the proper position on the footbed. EVA midsole offers cushioning and shock absorption with a lightweight feel.