100% preshrunk cotton; Antique (Cherry Red, Jade Dome, Irish Green, Sapphire, Orange) and Sport Grey are 90% cotton, 10% polyester; Sunset, Safety Pink, Russet, Neon (Green, Blue), Midnight, Lilac, Blackberry, Tweed, Safety Green, S. Orange, Dark Heather, Graphite Heather, and Heather (Military Green, Radiant Orchid, Red, Sapphire) are 50% cotton, 50% polyester; Ash Grey is 99% cotton, 1% polyester; Made with sustainably and fairly grown USA cotton; Seamless rib at neck; Taped shoulder-to-should