After a massive swell takes you under, don't spend the rest of the afternoon searching for your board. The FCS 12' Big Wave Essential Leash keeps your board nearby, creating a "ball and chain" effect that prevents your board from straying too far. The durable, slightly thicker than usual polyurethane cord offers immense strength and stretch, while the stainless steel swivels are durable and reliable for set after set of burly riding.