4.5 oz./yd², 100% combed ringspun cotton; Heather is 90/10 combed ringspun cotton/polyester; White is sewn with 100% cotton thread; Topstitched ribbed collar; Self-fabric back neck tape; Double-needle sleeves and bottom hem; CPSIA compliant tracking label in side seam; Easy Tear™ label; This product meets the following Sustainable Style subcategory:Socially Conscious Manufacturing: This product was made in a facility that is WRAP certified