OLUKAI Kai Ko Leather Men's Flip Flop Sandal Leather Upper: Smooth full-grain leather featuring a unique thick-gauge stitch detail and jersey knit lining with neoprene backer Footbed: Anatomical compression-molded EVA midsole with a smooth full-grain leather footbed. Outsole: Non-marking rubber outsole with molded siping and coral reef inspired lug pattern. Soft nylon toe post, embroidered hook logo, and laser etched footbed logo with detail stitch. Olukai Kai Ko Leather Men\\\'s Flip Flop Sandal