OLUKAI. 20457-407B. KUI. BLACK WITH FOG. House slipper or cozy slip-on-- It s hard to tell with the shearling-lined Ku i. Built with your comfort in mind this leisure look is made to go from the couch to coffee run to surf check. The ultra-puffy shearling and modernized sole offer maximum comfort that s sturdy enough to take on daily excursions.