When the swell picks up, it s time for the Kainui surf leash. Designed with double overhead to triple overhead surf in mind, the Kainui builds on Dakine s surf leash heritage. This 5/16-inch (8mm) urethane Dura-Cord leash features a beefy 2-inch molded neoprene ankle cuff and a wide 1.5-inch detachable railsaver. The Kainui surf leash is offered in 6-, 7- and 8-foot lengths.