OLUKAI Kumu Sandal - Women's Leather Upper: Antiqued or metallic full-grain leather straps with soft synthetic leather lining. Footbed: Anatomical compression-molded EVA midsole with waxed pull-up full-grain leather footbed. Outsole: Non-marking gum rubber outsole with traction pods. Soft nylon toe post webbing, decorative footbed stitching, embroidered and embossed logo detailing. Outboard Strap