Threadfast Apparel Unisex Epic Heavyweight T-Shirt ul)6.5 oz./yd2., 100% USA grown cotton preshrunk jersey, 16 singles. Heather Grey: 90/10 cotton/polyester. Generous fit. Set-in 1×1 rib collar. Self-fabric shoulder to shoulder neck tap. Ribbed cuffs. Tear away label. U.S. Grown Cotton, produced using best practices to conserve resources, protect soil, and promote biodiversity.. Threadfast is a proud member of the Better Cotton Initiative (BCI). Cotton products from Threadfast support more sustainable cotton farming. Better Cotton is sourced via a system of mass balance.. Every Threadfast product contributes to the Plant with Threadfast program..