OLUKAI Hokua Sandal - Men's Charcoal/Dark Shadow 15 Synthetic Upper: Water-resistant synthetic leather strap with soft, quick-drying jersey knit lining and neoprene backer. Footbed: Anatomical compression-molded EVA midsole with a brushed ICEVA drop-in footbed for personalized fit. Outsole: Non-marking gum rubber outsole, lugged and siped for enhanced grip. Features: Heavyweight deco stitching, soft nylon toe post webbing, laser etched footbed, and embroidered logo.