Back on Track Therapeutic Fleece Supreme Rug for Horses, Black Back on Track Rugs are Made From Fabric Infused With Ceramic Powder; The Ceramic Reflects Natural Body Heat and Creates a Soothing Infrared Warmth The Thermal Warmth Helps Increase The Blood Circulation And Helps Your Horse's Muscles Recover, Stay Looser And Become Less Inflamed The Rugs/Blankets Can Be Used Like A Liner Under Your Own Blanket When Its Cold Out Back on Track's Welltex Material Will Never Lose Its Effectiveness Even If The Products End Up in The Dryer