Modern textile technology combines with ancient Chinese medicine to help relax your dog's muscles and relieve joint pain!   Back on Track's black therapeutic crate liner/mat is made with a unique fabric designed to provide soothing thermal infrared warmth to your special canine. During the fabric's manufacturing process, ceramic particles are fused into the fibers. When heated, the ceramic particles radiate a heat back towards the dog's body. This reflected heat (long wave infrared heat radiation) increases blood circulation. The increased blood circulation in the tissues helps to relieve muscle tension and improve performance. Say goodbye to restless nights and achy joints with Back on Track's crate liner!