Uppers: Faux Leather or Natural Cork.Footbed: Microfiber wrapped EVA, absorbs shock, reducing stress on feet, ankles and knees.Outsole: Durable rubber with a patterned tread provides traction on a variety of surfaces.Orthaheel Technology is biomechanically 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)