5.0 oz., 100% combed ringspun cotton, 1x1 baby ribHeather is 93/7 combed ringspun cotton/polyester White is sewn with 100% cotton threadFlatlock seamsDouble-needle stitched rib binding on neck, shoulders, sleeves and leg openingsReinforced three-snap closure on bindingCPSIA Compliant - tracking label in side seam