The ProTEQ Shirt is a 100% Polyester (similar material to Under Armor) shirt that is tear resistant, stretchy, moisture wicking, and has seamless shoulders.  When we purchased them from our local shirt embroiderer, we asked for the toughest "catch all" shirt in her catalog, and this is what she proposed.  We've tested them for over a year and they truly are tough, lightweight, and comfortable shirts.  Order your's when you order your next holster and we'll ship them together!  Thank you all for your support and advertising!  Check out the cool video for more!