Footbed: Anatomical compression-molded EVA midsole with a premium full-grain leather footbed cover and leather binding edge. Outsole: Non-marking gum rubber outsole with fish scale inspired design for added traction and durability. Non-marking Rubber: Our thermoset rubber is a compound of natural and synthetic rubber that will not leave marks or ‘scuffs’ on surfaces of any type. Our gum rubber outsoles, as a natural material, will always naturally be non-marking. Upper: Our premium full-grain leather evokes the rustic spirit of Hawaii's upcountry ranches with a rugged strength and a lifetime of durability.