The Back On Track unisex T-Shirt provides soothing warmth that’s particularly helpful for shoulder and upper back discomfort. With Back on Track's state-of-the-art Welltex material, a blend of polyester with ceramic powder melted into the threads, this shirt may be helpful for sore muscles, joints, and tendons. This T-Shirt may be worn prior to exercise to loosen and warm up muscles. Some people wear it in the winter for additional warmth.