When the swell picks up it's time to step up to the Kainui surf leash for head high to double overhead surf. The Kainui builds on Dakine's heritage as a surf leash brand founded on the North Shore of Hawaii in 1979. This 1/4-inch (6.5mm) urethane Dura-Cord leash features a beefier 2-inch molded neoprene ankle cuff and wider 1.5-inch detachable railsaver. The Kainui is your go to leash when the conditions start trending bigger. The Kainui surf leash is offered in 6-, 7- and 8-foot lengths.