Surfboard leashes are a very hand piece of surfing equipment. Not only do they keep your board from disappearing half way down the beach, but they are a great safety tether. When it comes to selecting a surfboard leash for your surfboard, a simple rule when selecting a leash size - try and match the length of the leash with the length of the your board. So if you have a 6' Surfboard, a 6' leash would compliment it well.