5.5 oz./yd, 100% ringspun USA cotton. Heather Grey is 90/10 ringspun cotton/polyester. Other Heathers are 50/50 ringspun cotton/polyester. Reactive-dyed for longer lasting color. Pre-washed to minimize shrinkage. Ribbed collar. Taped neck and shoulders. Double needle stitching on bottom hem. Ribbed cuffs. Tear away label. USMCA certified.