Rug binding is a process that is used to finish rugs once they have been hooked. Cotton twill tape is used for rug binding; the color of tape you choose should match the color of the rug itself so that it blends. There are a couple different ways in which you can apply binding, with the most commonly chosen method is turning the binding down to the bottom side of your rug, and then sew it in place. You also have the option of leaving a bit of the binding showing and then turning it under.