5 oz. 100% combed ringspun cotton 1x1 baby rib; White is sewn with 100% cotton thread; Heather is 88/12 combed ringspun cotton/polyester 1x1 baby rib; Flatlock seams; Double-needle ribbed binding on neck and shoulders; Easytearâ„¢ label; Sideseam construction; CPSIA compliant tracking label in sideseam; Baby rib cuffs on sleeves and leg opening; Reinforced snap closure