The main parts of a SUP leash are the cuff, swivel, cord, rail saver, and leash string. Here’s a couple of words about each of them so you better understand their function.
Cuff: The part that goes around your ankle or calf, keeps you attached to the board
Swivel: Metal part that connects the cuff and cord, prevents tangling
Cord: Strongest part of the leash, connects the cuff to the rail saver
Rail Saver: Piece of webbing that protects the board from damage when the cord is tightened
Leash String: Heavy-duty string that is tied directly to the board’s leash plug