4.4-ounce, 100% recycled polyester interlock with PosiCharge technology body 4.1-ounce, 100% recycled polyester ultra-fine flat back mesh with PosiCharge technology This product's carbon footprint has been measured and reduced through a combination of preferred materials and investing in carbon offset projects though the ClimeCo Certified Product ™ Program Moisture-wicking Odor-resistant Self-fabric collar Self-fabric neck tape Mesh back panel, under arm inserts, and colorblocked mesh sleeve insets 2-button Y-neck placket Dyed-to-match buttons Forward shoulder seams Tear-away label A C-FREE ® Product