Back on Track T-Shirt provides soothing heat therapy that’s particularly helpful in relieving shoulder pain. How do we accomplish this? With Back on Track’s specially designed Welltex fabric, a blend of polyester with ceramic powder melted into the threads. The ceramic reflects your own body warmth and creates a soothing far infrared thermal heat, which may help reduces pain and inflammation, relaxes muscles, and increases blood circulation. Heat therapy is a well-recognized method used for healing injured muscles, joints, and tendons. For injury prevention, you can wear this T-Shirt prior to exercise to loosen and warm up muscles. Some people wear it in the winter for additional warmth.