4.5 oz., 100% combed ringspun cotton, 30 singles Heather is 93/7 combed ringspun cotton/polyester CVC colors are 60/40 cotton/polyester White is sewn with 100% cotton thread Topstitched ribbed crewneck Double-needle stitched bottom hem Shoulder-to-shoulder self-fabric back neck tape Ribbed cuffs Side seam construction CPSIA compliant tracking label in side seam EasyTear™label