Champion 90563006267 W0779 Vapor Womens Tank, Black Heather & Granite Heather - Medium Fabric Content: 100% Polyester. FreshIQ advanced odor protection technology helps tank resist odor. Lightweight, quick drying fabric stretches for ease. Mesh insets at armholes for cooling airflow. Chafe-resistant flatlock seams won`t irritate skin. Racerback helps keep straps in place.