5.0 oz. 100% combed ringspun cotton 1x1 baby rib; White is sewn with 100% cotton thread; Heather is 88% combed ringspun cotton, 12% polyester 1x1 baby rib; Flatlock seams; Coverstitch ribbed binding on neck, shoulders and sleeves; Fold over mitten cuffs; Coverstitch elastic bottom; Coverstitching sewn w/white polyester thread on all colors; Double-needle ribbed binding on neck, shoulders, sleeves and leg openings; EasyTear label; Sideseam construction; CPSIA compliant tracking label in seam