It's a crazy world out there, hard saying what will happen when you're on the open seas (or the pond in your back yard). This leash will keep your board within grabbing distance, and it coils up to minimize getting in your way.

I bought this to be paired with my SUP. The calf strap is so comfortable that I forget it is attached. The coiled cable keeps the 11 feet of leash from dragging in the water, and slowing me down. It also keeps my dog from getting tangled up while he is in the copilot position. My board has not run away and smashed into an innocent bystander.