A good leash! A cheap, thin leash is a liability. It can snap, sending your board flying into others—a major safety hazard known as a “board missile.“ Invest in a solid, urethane-cord leash that matches your board’s length. It’s your connection to your equipment and a critical piece of safety gear for everyone in the water. While you’re at it, make sure the rail saver is properly attached to your board’s plug. Trust us, swimming in after a lost board is no fun.