Vionic Boho Bikercore Cork Black Leather Mule Clog built Orthotic Comfort Size 6 in excellent condition! Vio-Motion Technology is designed to hug your arches and support your feet in comfort. Vionic sandals' built-in orthotic is shown to be effective in helping to treat heel pain (plantar fasciitis). An eclectic material mix and our arch-hugging footbed meld statement style with serious support on this best-selling slip-on. Upper: Leather. Footbed Lining: Microfiber Covered EVA. Outsole: Rubber. Heel Height: 1.25".