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; Mesh back panel and collar piecing; Colorblocked mesh upper side panels; Dyed-to-match reverse coil zipper; Tear-away label; A C-FREE Product