Solid colors: Made of 100% Cotton; Heather Grey: Contains 90% Cotton and 10% Polyester; Dark Heather and Heather Blue: Comprised of 50% Cotton and 50% Polyester; OR Dark Heather, Heather Blue, and All Other Heathers: Consists of 65% Polyester and 35% Cotton; Girls' Heathers: 60% Cotton and 40% Polyester