OluKai Women's Kumu Koa / Koa Sandal - 10-10 D(M) US Leather Upper is made from Full-grain high character leather upper and soft microfiber lining. Comfort Footbed features compression-molded EVA midsole with a full-grain leather footbed. Anatomically correct contour for a personalized fit and sustained comfort over time. The outsole is Non-marking rubber outsole with wave-inspired artwork. Other details include: Soft nylon toe post webbing- microstitched footbed outline- embossed hook design on footbed. olukai