The first ever Quarterback/Pitching shirt with fabric that heats up. Designed to help get muscles warm and keep them warm. Features body mapping with HEATR in the upper arms and upper body where your major muscles are for throwing designed to keep key muscles warms as well as WikMax located in  the rest of the shirt for great wicking and comfort.  Worn by the PROS.  100% MADE IN THE USA HEATR is a fiber that expands and heats up as it comes in contact with skin. Our Wikmax HEATR fabric generates heat as it wicks moisture off away from the skin. Wikmax HEATR is designed to help warm up muscles continuously, as well as increasing oxygen flow to the blood which helps decrease recovery time. HEATR feels soft and comfortable like cotton while utilizing its’ advanced technology. HEATR features a technology which assists in destroying and inhibiting the growth of bacteria while simultaneously cutting down on odor.