For use in Hotronic's Semi Custom-Heat Ready Insoles or on custom insoles, orthotics or insoles of your own choice. Installation is easy, simply slice a narrow slit through the insole and run the cord through. Apply the self adhesive fabric then trim as needed. Apply the fabric strip for comfort and voila! Your feet are toasty again and ready for the elements. . Model Year: 2011, Product ID: 86662