6.4 oz/SqYd, 31/1. 100% ring spun US cotton; Made with 100% soft ring spun cotton fabric and cotton threads; Made with OEKO-TEX certified low-impact dyes, clean pigment dye colors are salt free;1x1 rib collar, cuffs and waistband; Rolled forward shoulder; Relaxed fit, seamless body; Signature twill label and back neck tape; Proud member of the U.S. Cotton Trust Protocol;