OluKai Women's Kumu Off-White/Rattan Sandal Leather Upper: Antiqued or metallic full grain leather straps with pigskin lining and neoprene backer. Footbed: Anatomical compression-molded EVA midsole with full grain leather footbed. Arch support / orthotic foot bed is great for people with plantar fasciitis and those who want to avoid arch and heel pain. Styling: Soft nylon toe post webbing - decorative stitching - embroidered and embossed logo detailing. Non-marking rubber or gum rubber outsole with perimeter razor siping for grip on wet surfaces.