7.7-ounce 89% recycled polyester/11% spandex interlock knit (solids) 7.7-ounce 81% recycled polyester/8% polyester/11% spandex interlock knit (heathers)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 Snag-resistant Moisture-wicking UPF rating of 50 Self-piped zipper placket Forward shoulder Dyed-to-match recycled reverse coil zipper with silicone-tipped drawcord pull Self-turned cuffs Scalloped drop tail hem Deep side vents Tag-free labelDue to the nature of 100% polyester performance fabrics special care must be taken throughout the printing process.