The ThrowTech Sports™ pitching shirts work very well at keeping the throwing side arm, shoulder, chest and scapular areas activated while providing a feeling of comfort to the rest of the upper body. These shirts help get the arm activated and keep the arm activated between the warm up and cool down periods pitchers typically go through in game or practice conditions. They make left and right handed pitching shirts for all game or practice weather conditions which provide another level of arm protection for the pitchers..”