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 through the ClimeCo Certified Product ™ Program Moisture-wicking Odor-resistant Mesh back panel and collar piecing Colorblocked mesh upper side panels Dyed-to-match reverse coil zipper Tear-away label A C-FREE ® Product