This Horseware XL liner system gives your rug superior insulation properties without the need for two rugs. It's easy to use - simply attach the liner via Velcro loops to the neck area of the outer rug, and clip onto the back corners to keep the liner in place. Made from 210T Polyester outer and lining, with fiberfill, the liner is compatible with all XL rugs that show the liner system icon. It's machine washable for easy maintenance.