Back on Track Therapeutic Dog Crate Liner, 39 by 27-Inch The Back on Track Therapeutic Dog Crate Liner Is Made From Welltex Fabric Infused With Ceramic The Ceramic Reflects Your Dog's Natural Body Warmth and Creates a Soothing Far Infrared Thermal Warmth Our State-of-The-Art Therapy Product Is Clinically Proven To Reduce Pain and Chronic Inflammation The Infrared Warmth Relaxes Your Dog's Muscles and Relieves Joint Pain The Back on Track Therapeutic Dog Crate Liner Is Available In a Variety of Sizes to Best Fit Your Pet's Crate