The OluKai Men's Nui Sandal uses decorative stitching on footbed, hand-sewn whipstitching, soft nylon toe post, embroidered logo, and premium full grain leather. What more can we ask for? Features: Non-marking rubber and gum rubber outsole with island inspired pod design. Compression-molded EVA footbed topped with premium full-grain leather. Anatomically correct contour for a personalized fit and sustained comfort over time. 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.