Our Back on Track Long Sleeved Shirt provides soothing relief to shoulder, upper back, and arm discomfort. Using our Welltex material, our Long Sleeved Shirt provides a soothing far infrared effect that can be helpful to injure and sore muscles, joints, and tendons. For injury prevention, this shirt can be worn prior to exercise to loosen and warm up muscles. This shirt can also be worn in the winter for additional warmth. We provide two versions: the Cotton/Polyester blend, which is a ribbed material and the Polypropylene, which is smoother.