Fabric is made of 100% ring spun cotton (colors). Antique Cherry Red, Antique Heliconia Pink, Antique Sapphire Blue, and Sport Grey are 90/10% cotton/polyester, and Graphite Heather is 50/50% cotton/polyester. Dark Heather Gray, Heather Irish Green, Heather Military Green, Heather Navy, Heather Orange, Heather Purple, Heather Royal Blue, and Heather Red are 35/65% cotton/polyester, and Graphite Heather is 50/50% ring spun cotton/polyester. Not all colors available in all sizes.