Performance Wicking Moisture Management Cool-Base Crewneck Shirt/Jersey Undershirt Performance Athletic Short Sleeve Cool & Comfortable Crewneck Cool and Comfortable Shirt/Jersey Undershirt. 100% Polyester Fabric Wicks Moisture Away from Body. Athletic Shirt/Undershirt for All Sports: Baseball/Softball, Basketball, Football, Running/Cylcing, Lacrosse, etc. Short Sleeve Shirt with Double-Needle Stitching at Sleeves and Bottom Hem