Vionic with Orthaheel Relax Luxe Synthetic Synthetic sole Built-in, podiatrist-designed orthotic footbed helps support, stabilize and naturally realign your feet for better posture and balance. Faux fur upper features a hook-and-loop instep strap for easy adjustability. Durable, textured thermoplastic 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.