OLUKAI. 10276-DE25. OHANA KOA. TRENCH BLUE WITH POI. The Ohana Koa a stylish member of the water-resistant Ohana family lives up to its name with a split-strap design that speaks to those that dare to push the boundaries. With a coral reef lug design on the outsole for added grip and traction if the boundary is slippery--then you ll be just fine.