5 oz./yd, 100% combed ring-spun cotton; EasyTear(TM) label; 1x1 baby rib. Heather is 90/10 cotton/polyester; Granite Heather is 60/40 cotton/polyester. White is sewn with 100% cotton thread; Double-needle stitched rib binding on neck, and armholes. This product meets the following Sustainable Style subcategory: Socially Conscious Manufacturing: This product was made in a facility that is WRAP certified. For breeds with larger chests, purchase one size up from weight range.