Serious swells call for a serious leash, the Kainui Big Wave leash offers the security you need in double overhead to triple overhead surf. Constructed of the highest quality 5/16-inch (8mm) urethane Dura-Cord for maximum strength to keep you connected to your board in even the strongest surf. The Kainui is a continuation of Dakine's dedication since 1979 to making and refining surf leashes that protect both surfers and their boards in the most consequential conditions. The Kainui Big Wave surf leash is offered in 7-, 8-, 9- and 10-foot lengths.