OLUKAI. 10101-LRLR. HIAPO. LAVA ROCK. What makes an OluKai sandal truly built to last We like to think it s a few things-- tradition craftsmanship and attention to detail. The Hiapo is constructed with naturally tumbled or marbled full-grain leather using hand-sewn traditional whipstitching complete with Moko tattoo artwork details on the footbed. One of our original sandals -hence its namesake- Hiapo only gets better with age.