Olukai Mens 10 Black Synthetic Upper: Water-resistant layered synthetic straps with wave-inspired emboss design Footbed: Lightweight anatomical compression molded EVA midsole and soft molded ICEVA drop in footbed with detailing that provides wet traction underfoot Outsole: Non-marking rubber outsole with a coral reef lug design for added grip. Features: perforated foam in upper to improve airflow around foot, soft nylon toe post and welded logos and details. Contoured footbeds to deliver the perfect balance of instant comfort and lasting support